-81=9(f+91)

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Solution for -81=9(f+91) equation: 



-81=9(f+91)

We move all terms to the left:

-81-(9(f+91))=0



We calculate terms in parentheses: -(9(f+91)), so:

9(f+91)

We multiply parentheses

9f+819

Back to the equation:

-(9f+819)



We get rid of parentheses

-9f-819-81=0

We add all the numbers together, and all the variables

-9f-900=0

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

-9f=900

f=900/-9

f=-100

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