120=(3x-7)x

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Solution for 120=(3x-7)x equation: 


Simplifying
120 = (3x + -7) * x

Reorder the terms:
120 = (-7 + 3x) * x

Reorder the terms for easier multiplication:
120 = x(-7 + 3x)
120 = (-7 * x + 3x * x)
120 = (-7x + 3x2)

Solving
120 = -7x + 3x2

Solving for variable 'x'.

Reorder the terms:
120 + 7x + -3x2 = -7x + 7x + 3x2 + -3x2

Combine like terms: -7x + 7x = 0
120 + 7x + -3x2 = 0 + 3x2 + -3x2
120 + 7x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
120 + 7x + -3x2 = 0

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

Divide each side by '-3'.
-40 + -2.333333333x + x2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -2.333333333x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -2.333333333x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -2.333333333x + x2 = 0 + 40
-2.333333333x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-2.333333333x + x2 = 40

The x term is -2.333333333x.  Take half its coefficient (-1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
-2.333333333x + 1.361111112 + x2 = 40 + 1.361111112

Reorder the terms:
1.361111112 + -2.333333333x + x2 = 40 + 1.361111112

Combine like terms: 40 + 1.361111112 = 41.361111112
1.361111112 + -2.333333333x + x2 = 41.361111112

Factor a perfect square on the left side:
(x + -1.166666667)(x + -1.166666667) = 41.361111112

Calculate the square root of the right side: 6.431260461

Break this problem into two subproblems by setting 
(x + -1.166666667) equal to 6.431260461 and -6.431260461.


Subproblem 1
x + -1.166666667 = 6.431260461

Simplifying
x + -1.166666667 = 6.431260461

Reorder the terms:
-1.166666667 + x = 6.431260461

Solving
-1.166666667 + x = 6.431260461

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1.166666667' to each side of the equation.
-1.166666667 + 1.166666667 + x = 6.431260461 + 1.166666667

Combine like terms: -1.166666667 + 1.166666667 = 0.000000000
0.000000000 + x = 6.431260461 + 1.166666667
x = 6.431260461 + 1.166666667

Combine like terms: 6.431260461 + 1.166666667 = 7.597927128
x = 7.597927128

Simplifying
x = 7.597927128


Subproblem 2
x + -1.166666667 = -6.431260461

Simplifying
x + -1.166666667 = -6.431260461

Reorder the terms:
-1.166666667 + x = -6.431260461

Solving
-1.166666667 + x = -6.431260461

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1.166666667' to each side of the equation.
-1.166666667 + 1.166666667 + x = -6.431260461 + 1.166666667

Combine like terms: -1.166666667 + 1.166666667 = 0.000000000
0.000000000 + x = -6.431260461 + 1.166666667
x = -6.431260461 + 1.166666667

Combine like terms: -6.431260461 + 1.166666667 = -5.264593794
x = -5.264593794

Simplifying
x = -5.264593794


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {7.597927128, -5.264593794}

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