18=9-a

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Solution for 18=9-a equation: 



18=9-a

We move all terms to the left:

18-(9-a)=0

We add all the numbers together, and all the variables

-(-1a+9)+18=0

We get rid of parentheses

1a-9+18=0

We add all the numbers together, and all the variables

a+9=0

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

a=-9

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