-3x-6x=21-12

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Solution for -3x-6x=21-12 equation: 


Simplifying
-3x + -6x = 21 + -12

Combine like terms: -3x + -6x = -9x
-9x = 21 + -12

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

Solving
-9x = 9

Solving for variable 'x'.

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

Divide each side by '-9'.
x = -1

Simplifying
x = -1

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