90=9(f+1)

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Solution for 90=9(f+1) equation: 



90=9(f+1)

We move all terms to the left:

90-(9(f+1))=0



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

9(f+1)

We multiply parentheses

9f+9

Back to the equation:

-(9f+9)



We get rid of parentheses

-9f-9+90=0

We add all the numbers together, and all the variables

-9f+81=0

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

-9f=-81

f=-81/-9

f=+9

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