x+2(5x-3)=x(7-x)

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Solution for x+2(5x-3)=x(7-x) equation:


Simplifying
x + 2(5x + -3) = x(7 + -1x)

Reorder the terms:
x + 2(-3 + 5x) = x(7 + -1x)
x + (-3 * 2 + 5x * 2) = x(7 + -1x)
x + (-6 + 10x) = x(7 + -1x)

Reorder the terms:
-6 + x + 10x = x(7 + -1x)

Combine like terms: x + 10x = 11x
-6 + 11x = x(7 + -1x)
-6 + 11x = (7 * x + -1x * x)
-6 + 11x = (7x + -1x2)

Solving
-6 + 11x = 7x + -1x2

Solving for variable 'x'.

Combine like terms: 11x + -7x = 4x
-6 + 4x + x2 = 7x + -1x2 + -7x + x2

Reorder the terms:
-6 + 4x + x2 = 7x + -7x + -1x2 + x2

Combine like terms: 7x + -7x = 0
-6 + 4x + x2 = 0 + -1x2 + x2
-6 + 4x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-6 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 4x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + 4x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 4x + x2 = 0 + 6
4x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
4x + x2 = 6

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 6 + 4

Reorder the terms:
4 + 4x + x2 = 6 + 4

Combine like terms: 6 + 4 = 10
4 + 4x + x2 = 10

Factor a perfect square on the left side:
(x + 2)(x + 2) = 10

Calculate the square root of the right side: 3.16227766

Break this problem into two subproblems by setting 
(x + 2) equal to 3.16227766 and -3.16227766.

Subproblem 1

x + 2 = 3.16227766 Simplifying x + 2 = 3.16227766 Reorder the terms: 2 + x = 3.16227766 Solving 2 + x = 3.16227766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 3.16227766 + -2 Combine like terms: 2 + -2 = 0 0 + x = 3.16227766 + -2 x = 3.16227766 + -2 Combine like terms: 3.16227766 + -2 = 1.16227766 x = 1.16227766 Simplifying x = 1.16227766

Subproblem 2

x + 2 = -3.16227766 Simplifying x + 2 = -3.16227766 Reorder the terms: 2 + x = -3.16227766 Solving 2 + x = -3.16227766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -3.16227766 + -2 Combine like terms: 2 + -2 = 0 0 + x = -3.16227766 + -2 x = -3.16227766 + -2 Combine like terms: -3.16227766 + -2 = -5.16227766 x = -5.16227766 Simplifying x = -5.16227766

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.16227766, -5.16227766}

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