-84=5x+2x

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Solution for -84=5x+2x equation: 



-84=5x+2x

We move all terms to the left:

-84-(5x+2x)=0

We add all the numbers together, and all the variables

-(+7x)-84=0

We get rid of parentheses

-7x-84=0

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

-7x=84

x=84/-7

x=-12

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