61-(3x+15)=3(x+6)x

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Solution for 61-(3x+15)=3(x+6)x equation:


Simplifying
61 + -1(3x + 15) = 3(x + 6) * x

Reorder the terms:
61 + -1(15 + 3x) = 3(x + 6) * x
61 + (15 * -1 + 3x * -1) = 3(x + 6) * x
61 + (-15 + -3x) = 3(x + 6) * x

Combine like terms: 61 + -15 = 46
46 + -3x = 3(x + 6) * x

Reorder the terms:
46 + -3x = 3(6 + x) * x

Reorder the terms for easier multiplication:
46 + -3x = 3x(6 + x)
46 + -3x = (6 * 3x + x * 3x)
46 + -3x = (18x + 3x2)

Solving
46 + -3x = 18x + 3x2

Solving for variable 'x'.

Combine like terms: -3x + -18x = -21x
46 + -21x + -3x2 = 18x + 3x2 + -18x + -3x2

Reorder the terms:
46 + -21x + -3x2 = 18x + -18x + 3x2 + -3x2

Combine like terms: 18x + -18x = 0
46 + -21x + -3x2 = 0 + 3x2 + -3x2
46 + -21x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
46 + -21x + -3x2 = 0

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

Divide each side by '-3'.
-15.33333333 + 7x + x2 = 0

Move the constant term to the right:

Add '15.33333333' to each side of the equation.
-15.33333333 + 7x + 15.33333333 + x2 = 0 + 15.33333333

Reorder the terms:
-15.33333333 + 15.33333333 + 7x + x2 = 0 + 15.33333333

Combine like terms: -15.33333333 + 15.33333333 = 0.00000000
0.00000000 + 7x + x2 = 0 + 15.33333333
7x + x2 = 0 + 15.33333333

Combine like terms: 0 + 15.33333333 = 15.33333333
7x + x2 = 15.33333333

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 15.33333333 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 15.33333333 + 12.25

Combine like terms: 15.33333333 + 12.25 = 27.58333333
12.25 + 7x + x2 = 27.58333333

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 27.58333333

Calculate the square root of the right side: 5.251983752

Break this problem into two subproblems by setting 
(x + 3.5) equal to 5.251983752 and -5.251983752.

Subproblem 1

x + 3.5 = 5.251983752 Simplifying x + 3.5 = 5.251983752 Reorder the terms: 3.5 + x = 5.251983752 Solving 3.5 + x = 5.251983752 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 5.251983752 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 5.251983752 + -3.5 x = 5.251983752 + -3.5 Combine like terms: 5.251983752 + -3.5 = 1.751983752 x = 1.751983752 Simplifying x = 1.751983752

Subproblem 2

x + 3.5 = -5.251983752 Simplifying x + 3.5 = -5.251983752 Reorder the terms: 3.5 + x = -5.251983752 Solving 3.5 + x = -5.251983752 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -5.251983752 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -5.251983752 + -3.5 x = -5.251983752 + -3.5 Combine like terms: -5.251983752 + -3.5 = -8.751983752 x = -8.751983752 Simplifying x = -8.751983752

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.751983752, -8.751983752}

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