7(3f+4)=91

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Solution for 7(3f+4)=91 equation: 



7(3f+4)=91

We move all terms to the left:

7(3f+4)-(91)=0

We multiply parentheses

21f+28-91=0

We add all the numbers together, and all the variables

21f-63=0

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

21f=63

f=63/21

f=3

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