-12=18+x

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Solution for -12=18+x equation: 



-12=18+x

We move all terms to the left:

-12-(18+x)=0

We add all the numbers together, and all the variables

-(x+18)-12=0

We get rid of parentheses

-x-18-12=0

We add all the numbers together, and all the variables

-1x-30=0

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

-x=30

x=30/-1

x=-30

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