91=7(f+3)

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Solution for 91=7(f+3) equation: 



91=7(f+3)

We move all terms to the left:

91-(7(f+3))=0



We calculate terms in parentheses: -(7(f+3)), so:

7(f+3)

We multiply parentheses

7f+21

Back to the equation:

-(7f+21)



We get rid of parentheses

-7f-21+91=0

We add all the numbers together, and all the variables

-7f+70=0

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

-7f=-70

f=-70/-7

f=+10

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