-12=3x-6=21

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



-12=3x-6=21

We move all terms to the left:

-12-(3x-6)=0

We get rid of parentheses

-3x+6-12=0

We add all the numbers together, and all the variables

-3x-6=0

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

-3x=6

x=6/-3

x=-2

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