18=9(x+80)

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Solution for 18=9(x+80) equation: 



18=9(x+80)

We move all terms to the left:

18-(9(x+80))=0



We calculate terms in parentheses: -(9(x+80)), so:

9(x+80)

We multiply parentheses

9x+720

Back to the equation:

-(9x+720)



We get rid of parentheses

-9x-720+18=0

We add all the numbers together, and all the variables

-9x-702=0

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

-9x=702

x=702/-9

x=-78

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