18x^2+5x=3+7x

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Solution for 18x^2+5x=3+7x equation:


Simplifying
18x2 + 5x = 3 + 7x

Reorder the terms:
5x + 18x2 = 3 + 7x

Solving
5x + 18x2 = 3 + 7x

Solving for variable 'x'.

Reorder the terms:
-3 + 5x + -7x + 18x2 = 3 + 7x + -3 + -7x

Combine like terms: 5x + -7x = -2x
-3 + -2x + 18x2 = 3 + 7x + -3 + -7x

Reorder the terms:
-3 + -2x + 18x2 = 3 + -3 + 7x + -7x

Combine like terms: 3 + -3 = 0
-3 + -2x + 18x2 = 0 + 7x + -7x
-3 + -2x + 18x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-3 + -2x + 18x2 = 0

Begin completing the square.  Divide all terms by
18 the coefficient of the squared term: 

Divide each side by '18'.
-0.1666666667 + -0.1111111111x + x2 = 0

Move the constant term to the right:

Add '0.1666666667' to each side of the equation.
-0.1666666667 + -0.1111111111x + 0.1666666667 + x2 = 0 + 0.1666666667

Reorder the terms:
-0.1666666667 + 0.1666666667 + -0.1111111111x + x2 = 0 + 0.1666666667

Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000
0.0000000000 + -0.1111111111x + x2 = 0 + 0.1666666667
-0.1111111111x + x2 = 0 + 0.1666666667

Combine like terms: 0 + 0.1666666667 = 0.1666666667
-0.1111111111x + x2 = 0.1666666667

The x term is -0.1111111111x.  Take half its coefficient (-0.05555555555).
Square it (0.003086419752) and add it to both sides.

Add '0.003086419752' to each side of the equation.
-0.1111111111x + 0.003086419752 + x2 = 0.1666666667 + 0.003086419752

Reorder the terms:
0.003086419752 + -0.1111111111x + x2 = 0.1666666667 + 0.003086419752

Combine like terms: 0.1666666667 + 0.003086419752 = 0.169753086452
0.003086419752 + -0.1111111111x + x2 = 0.169753086452

Factor a perfect square on the left side:
(x + -0.05555555555)(x + -0.05555555555) = 0.169753086452

Calculate the square root of the right side: 0.412011027

Break this problem into two subproblems by setting 
(x + -0.05555555555) equal to 0.412011027 and -0.412011027.

Subproblem 1

x + -0.05555555555 = 0.412011027 Simplifying x + -0.05555555555 = 0.412011027 Reorder the terms: -0.05555555555 + x = 0.412011027 Solving -0.05555555555 + x = 0.412011027 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05555555555' to each side of the equation. -0.05555555555 + 0.05555555555 + x = 0.412011027 + 0.05555555555 Combine like terms: -0.05555555555 + 0.05555555555 = 0.00000000000 0.00000000000 + x = 0.412011027 + 0.05555555555 x = 0.412011027 + 0.05555555555 Combine like terms: 0.412011027 + 0.05555555555 = 0.46756658255 x = 0.46756658255 Simplifying x = 0.46756658255

Subproblem 2

x + -0.05555555555 = -0.412011027 Simplifying x + -0.05555555555 = -0.412011027 Reorder the terms: -0.05555555555 + x = -0.412011027 Solving -0.05555555555 + x = -0.412011027 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05555555555' to each side of the equation. -0.05555555555 + 0.05555555555 + x = -0.412011027 + 0.05555555555 Combine like terms: -0.05555555555 + 0.05555555555 = 0.00000000000 0.00000000000 + x = -0.412011027 + 0.05555555555 x = -0.412011027 + 0.05555555555 Combine like terms: -0.412011027 + 0.05555555555 = -0.35645547145 x = -0.35645547145 Simplifying x = -0.35645547145

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.46756658255, -0.35645547145}

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