-9=-3x-12

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



-9=-3x-12

We move all terms to the left:

-9-(-3x-12)=0

We get rid of parentheses

3x+12-9=0

We add all the numbers together, and all the variables

3x+3=0

We move all terms containing x to the left, all other terms to the right

3x=-3

x=-3/3

x=-1

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