-40=12x-4x

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Solution for -40=12x-4x equation: 



-40=12x-4x

We move all terms to the left:

-40-(12x-4x)=0

We add all the numbers together, and all the variables

-(+8x)-40=0

We get rid of parentheses

-8x-40=0

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

-8x=40

x=40/-8

x=-5

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