18=(-a+9)

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Solution for 18=(-a+9) equation: 



18=(-a+9)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -((-1a+9)), so:

(-1a+9)

We get rid of parentheses

-1a+9

Back to the equation:

-(-1a+9)



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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