-3=18+3x

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Solution for -3=18+3x equation: 



-3=18+3x

We move all terms to the left:

-3-(18+3x)=0

We add all the numbers together, and all the variables

-(3x+18)-3=0

We get rid of parentheses

-3x-18-3=0

We add all the numbers together, and all the variables

-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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