-21=-3x+6x

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



-21=-3x+6x

We move all terms to the left:

-21-(-3x+6x)=0

We add all the numbers together, and all the variables

-(+3x)-21=0

We get rid of parentheses

-3x-21=0

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

-3x=21

x=21/-3

x=-7

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