2x^2-20x=5x^2-7x-6

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Solution for 2x^2-20x=5x^2-7x-6 equation:


Simplifying
2x2 + -20x = 5x2 + -7x + -6

Reorder the terms:
-20x + 2x2 = 5x2 + -7x + -6

Reorder the terms:
-20x + 2x2 = -6 + -7x + 5x2

Solving
-20x + 2x2 = -6 + -7x + 5x2

Solving for variable 'x'.

Reorder the terms:
6 + -20x + 7x + 2x2 + -5x2 = -6 + -7x + 5x2 + 6 + 7x + -5x2

Combine like terms: -20x + 7x = -13x
6 + -13x + 2x2 + -5x2 = -6 + -7x + 5x2 + 6 + 7x + -5x2

Combine like terms: 2x2 + -5x2 = -3x2
6 + -13x + -3x2 = -6 + -7x + 5x2 + 6 + 7x + -5x2

Reorder the terms:
6 + -13x + -3x2 = -6 + 6 + -7x + 7x + 5x2 + -5x2

Combine like terms: -6 + 6 = 0
6 + -13x + -3x2 = 0 + -7x + 7x + 5x2 + -5x2
6 + -13x + -3x2 = -7x + 7x + 5x2 + -5x2

Combine like terms: -7x + 7x = 0
6 + -13x + -3x2 = 0 + 5x2 + -5x2
6 + -13x + -3x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
6 + -13x + -3x2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-2 + 4.333333333x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 4.333333333x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 4.333333333x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 4.333333333x + x2 = 0 + 2
4.333333333x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
4.333333333x + x2 = 2

The x term is 4.333333333x.  Take half its coefficient (2.166666667).
Square it (4.694444446) and add it to both sides.

Add '4.694444446' to each side of the equation.
4.333333333x + 4.694444446 + x2 = 2 + 4.694444446

Reorder the terms:
4.694444446 + 4.333333333x + x2 = 2 + 4.694444446

Combine like terms: 2 + 4.694444446 = 6.694444446
4.694444446 + 4.333333333x + x2 = 6.694444446

Factor a perfect square on the left side:
(x + 2.166666667)(x + 2.166666667) = 6.694444446

Calculate the square root of the right side: 2.58736245

Break this problem into two subproblems by setting 
(x + 2.166666667) equal to 2.58736245 and -2.58736245.

Subproblem 1

x + 2.166666667 = 2.58736245 Simplifying x + 2.166666667 = 2.58736245 Reorder the terms: 2.166666667 + x = 2.58736245 Solving 2.166666667 + x = 2.58736245 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + x = 2.58736245 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + x = 2.58736245 + -2.166666667 x = 2.58736245 + -2.166666667 Combine like terms: 2.58736245 + -2.166666667 = 0.420695783 x = 0.420695783 Simplifying x = 0.420695783

Subproblem 2

x + 2.166666667 = -2.58736245 Simplifying x + 2.166666667 = -2.58736245 Reorder the terms: 2.166666667 + x = -2.58736245 Solving 2.166666667 + x = -2.58736245 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + x = -2.58736245 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + x = -2.58736245 + -2.166666667 x = -2.58736245 + -2.166666667 Combine like terms: -2.58736245 + -2.166666667 = -4.754029117 x = -4.754029117 Simplifying x = -4.754029117

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.420695783, -4.754029117}

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