-3x=9-(-12)

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Solution for -3x=9-(-12) equation: 


Simplifying
-3x = 9 + -1(-12)

Multiply -1 * -12
-3x = 9 + 12

Combine like terms: 9 + 12 = 21
-3x = 21

Solving
-3x = 21

Solving for variable 'x'.

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

Divide each side by '-3'.
x = -7

Simplifying
x = -7

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