-21=3+3x

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Solution for -21=3+3x equation: 



-21=3+3x

We move all terms to the left:

-21-(3+3x)=0

We add all the numbers together, and all the variables

-(3x+3)-21=0

We get rid of parentheses

-3x-3-21=0

We add all the numbers together, and all the variables

-3x-24=0

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

-3x=24

x=24/-3

x=-8

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