7(f+8)=91

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Solution for 7(f+8)=91 equation: 



7(f+8)=91

We move all terms to the left:

7(f+8)-(91)=0

We multiply parentheses

7f+56-91=0

We add all the numbers together, and all the variables

7f-35=0

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

7f=35

f=35/7

f=5

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