18+3=(9f-13)

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Solution for 18+3=(9f-13) equation: 



18+3=(9f-13)

We move all terms to the left:

18+3-((9f-13))=0

We add all the numbers together, and all the variables

-((9f-13))+21=0



We calculate terms in parentheses: -((9f-13)), so:

(9f-13)

We get rid of parentheses

9f-13

Back to the equation:

-(9f-13)



We get rid of parentheses

-9f+13+21=0

We add all the numbers together, and all the variables

-9f+34=0

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

-9f=-34

f=-34/-9

f=3+7/9

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