-21=-3+6x

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



-21=-3+6x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(6x-3)-21=0

We get rid of parentheses

-6x+3-21=0

We add all the numbers together, and all the variables

-6x-18=0

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

-6x=18

x=18/-6

x=-3

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