-12=7x-3x

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Solution for -12=7x-3x equation: 



-12=7x-3x

We move all terms to the left:

-12-(7x-3x)=0

We add all the numbers together, and all the variables

-(+4x)-12=0

We get rid of parentheses

-4x-12=0

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

-4x=12

x=12/-4

x=-3

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