12x-3x=-72

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Solution for 12x-3x=-72 equation: 


Simplifying
12x + -3x = -72

Combine like terms: 12x + -3x = 9x
9x = -72

Solving
9x = -72

Solving for variable 'x'.

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

Divide each side by '9'.
x = -8

Simplifying
x = -8

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