18=-18+a

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Solution for 18=-18+a equation: 



18=-18+a

We move all terms to the left:

18-(-18+a)=0

We add all the numbers together, and all the variables

-(a-18)+18=0

We get rid of parentheses

-a+18+18=0

We add all the numbers together, and all the variables

-1a+36=0

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

-a=-36

a=-36/-1

a=+36

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