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-6=0

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

-x=6

x=6/-1

x=-6

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