18=-a-8a

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Solution for 18=-a-8a equation: 



18=-a-8a

We move all terms to the left:

18-(-a-8a)=0

We add all the numbers together, and all the variables

-(-9a)+18=0

We get rid of parentheses

9a+18=0

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

9a=-18

a=-18/9

a=-2

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