3x(x-5)-3x(x+7)=72

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Solution for 3x(x-5)-3x(x+7)=72 equation: 


Simplifying
3x(x + -5) + -3x(x + 7) = 72

Reorder the terms:
3x(-5 + x) + -3x(x + 7) = 72
(-5 * 3x + x * 3x) + -3x(x + 7) = 72
(-15x + 3x2) + -3x(x + 7) = 72

Reorder the terms:
-15x + 3x2 + -3x(7 + x) = 72
-15x + 3x2 + (7 * -3x + x * -3x) = 72
-15x + 3x2 + (-21x + -3x2) = 72

Reorder the terms:
-15x + -21x + 3x2 + -3x2 = 72

Combine like terms: -15x + -21x = -36x
-36x + 3x2 + -3x2 = 72

Combine like terms: 3x2 + -3x2 = 0
-36x + 0 = 72
-36x = 72

Solving
-36x = 72

Solving for variable 'x'.

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

Divide each side by '-36'.
x = -2

Simplifying
x = -2

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