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

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Solution for 12-(x+3)=2x(-5+x) equation:


Simplifying
12 + -1(x + 3) = 2x(-5 + x)

Reorder the terms:
12 + -1(3 + x) = 2x(-5 + x)
12 + (3 * -1 + x * -1) = 2x(-5 + x)
12 + (-3 + -1x) = 2x(-5 + x)

Combine like terms: 12 + -3 = 9
9 + -1x = 2x(-5 + x)
9 + -1x = (-5 * 2x + x * 2x)
9 + -1x = (-10x + 2x2)

Solving
9 + -1x = -10x + 2x2

Solving for variable 'x'.

Combine like terms: -1x + 10x = 9x
9 + 9x + -2x2 = -10x + 2x2 + 10x + -2x2

Reorder the terms:
9 + 9x + -2x2 = -10x + 10x + 2x2 + -2x2

Combine like terms: -10x + 10x = 0
9 + 9x + -2x2 = 0 + 2x2 + -2x2
9 + 9x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
9 + 9x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-4.5 + -4.5x + x2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + -4.5x + 4.5 + x2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + -4.5x + x2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + -4.5x + x2 = 0 + 4.5
-4.5x + x2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
-4.5x + x2 = 4.5

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 4.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 4.5 + 5.0625

Combine like terms: 4.5 + 5.0625 = 9.5625
5.0625 + -4.5x + x2 = 9.5625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(x + -2.25) equal to 3.092329219 and -3.092329219.

Subproblem 1

x + -2.25 = 3.092329219 Simplifying x + -2.25 = 3.092329219 Reorder the terms: -2.25 + x = 3.092329219 Solving -2.25 + x = 3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 3.092329219 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 3.092329219 + 2.25 x = 3.092329219 + 2.25 Combine like terms: 3.092329219 + 2.25 = 5.342329219 x = 5.342329219 Simplifying x = 5.342329219

Subproblem 2

x + -2.25 = -3.092329219 Simplifying x + -2.25 = -3.092329219 Reorder the terms: -2.25 + x = -3.092329219 Solving -2.25 + x = -3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -3.092329219 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -3.092329219 + 2.25 x = -3.092329219 + 2.25 Combine like terms: -3.092329219 + 2.25 = -0.842329219 x = -0.842329219 Simplifying x = -0.842329219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.342329219, -0.842329219}

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