-18+x=2x+21

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Solution for -18+x=2x+21 equation: 



-18+x=2x+21

We move all terms to the left:

-18+x-(2x+21)=0

We get rid of parentheses

x-2x-21-18=0

We add all the numbers together, and all the variables

-1x-39=0

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

-x=39

x=39/-1

x=-39

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