-18=30+3x

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Solution for -18=30+3x equation: 



-18=30+3x

We move all terms to the left:

-18-(30+3x)=0

We add all the numbers together, and all the variables

-(3x+30)-18=0

We get rid of parentheses

-3x-30-18=0

We add all the numbers together, and all the variables

-3x-48=0

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

-3x=48

x=48/-3

x=-16

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