-12=-3x+9

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



-12=-3x+9

We move all terms to the left:

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

We get rid of parentheses

3x-9-12=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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