18=9a-18

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Solution for 18=9a-18 equation: 



18=9a-18

We move all terms to the left:

18-(9a-18)=0

We get rid of parentheses

-9a+18+18=0

We add all the numbers together, and all the variables

-9a+36=0

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

-9a=-36

a=-36/-9

a=+4

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