-81=9(f-100)

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Solution for -81=9(f-100) equation: 



-81=9(f-100)

We move all terms to the left:

-81-(9(f-100))=0



We calculate terms in parentheses: -(9(f-100)), so:

9(f-100)

We multiply parentheses

9f-900

Back to the equation:

-(9f-900)



We get rid of parentheses

-9f+900-81=0

We add all the numbers together, and all the variables

-9f+819=0

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

-9f=-819

f=-819/-9

f=+91

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