18=9a+9a

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Solution for 18=9a+9a equation: 



18=9a+9a

We move all terms to the left:

18-(9a+9a)=0

We add all the numbers together, and all the variables

-(+18a)+18=0

We get rid of parentheses

-18a+18=0

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

-18a=-18

a=-18/-18

a=1

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