7(f-91)=21

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Solution for 7(f-91)=21 equation: 



7(f-91)=21

We move all terms to the left:

7(f-91)-(21)=0

We multiply parentheses

7f-637-21=0

We add all the numbers together, and all the variables

7f-658=0

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

7f=658

f=658/7

f=94

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