5x(x-1)-(6x+5)=5(3x+6)

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Solution for 5x(x-1)-(6x+5)=5(3x+6) equation:


Simplifying
5x(x + -1) + -1(6x + 5) = 5(3x + 6)

Reorder the terms:
5x(-1 + x) + -1(6x + 5) = 5(3x + 6)
(-1 * 5x + x * 5x) + -1(6x + 5) = 5(3x + 6)
(-5x + 5x2) + -1(6x + 5) = 5(3x + 6)

Reorder the terms:
-5x + 5x2 + -1(5 + 6x) = 5(3x + 6)
-5x + 5x2 + (5 * -1 + 6x * -1) = 5(3x + 6)
-5x + 5x2 + (-5 + -6x) = 5(3x + 6)

Reorder the terms:
-5 + -5x + -6x + 5x2 = 5(3x + 6)

Combine like terms: -5x + -6x = -11x
-5 + -11x + 5x2 = 5(3x + 6)

Reorder the terms:
-5 + -11x + 5x2 = 5(6 + 3x)
-5 + -11x + 5x2 = (6 * 5 + 3x * 5)
-5 + -11x + 5x2 = (30 + 15x)

Solving
-5 + -11x + 5x2 = 30 + 15x

Solving for variable 'x'.

Reorder the terms:
-5 + -30 + -11x + -15x + 5x2 = 30 + 15x + -30 + -15x

Combine like terms: -5 + -30 = -35
-35 + -11x + -15x + 5x2 = 30 + 15x + -30 + -15x

Combine like terms: -11x + -15x = -26x
-35 + -26x + 5x2 = 30 + 15x + -30 + -15x

Reorder the terms:
-35 + -26x + 5x2 = 30 + -30 + 15x + -15x

Combine like terms: 30 + -30 = 0
-35 + -26x + 5x2 = 0 + 15x + -15x
-35 + -26x + 5x2 = 15x + -15x

Combine like terms: 15x + -15x = 0
-35 + -26x + 5x2 = 0

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

Divide each side by '5'.
-7 + -5.2x + x2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -5.2x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -5.2x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -5.2x + x2 = 0 + 7
-5.2x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-5.2x + x2 = 7

The x term is -5.2x.  Take half its coefficient (-2.6).
Square it (6.76) and add it to both sides.

Add '6.76' to each side of the equation.
-5.2x + 6.76 + x2 = 7 + 6.76

Reorder the terms:
6.76 + -5.2x + x2 = 7 + 6.76

Combine like terms: 7 + 6.76 = 13.76
6.76 + -5.2x + x2 = 13.76

Factor a perfect square on the left side:
(x + -2.6)(x + -2.6) = 13.76

Calculate the square root of the right side: 3.709447398

Break this problem into two subproblems by setting 
(x + -2.6) equal to 3.709447398 and -3.709447398.

Subproblem 1

x + -2.6 = 3.709447398 Simplifying x + -2.6 = 3.709447398 Reorder the terms: -2.6 + x = 3.709447398 Solving -2.6 + x = 3.709447398 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + x = 3.709447398 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + x = 3.709447398 + 2.6 x = 3.709447398 + 2.6 Combine like terms: 3.709447398 + 2.6 = 6.309447398 x = 6.309447398 Simplifying x = 6.309447398

Subproblem 2

x + -2.6 = -3.709447398 Simplifying x + -2.6 = -3.709447398 Reorder the terms: -2.6 + x = -3.709447398 Solving -2.6 + x = -3.709447398 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + x = -3.709447398 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + x = -3.709447398 + 2.6 x = -3.709447398 + 2.6 Combine like terms: -3.709447398 + 2.6 = -1.109447398 x = -1.109447398 Simplifying x = -1.109447398

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.309447398, -1.109447398}

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