-21=3x+4x

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Solution for -21=3x+4x equation: 



-21=3x+4x

We move all terms to the left:

-21-(3x+4x)=0

We add all the numbers together, and all the variables

-(+7x)-21=0

We get rid of parentheses

-7x-21=0

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

-7x=21

x=21/-7

x=-3

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