100=5(f+7)

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Solution for 100=5(f+7) equation: 



100=5(f+7)

We move all terms to the left:

100-(5(f+7))=0



We calculate terms in parentheses: -(5(f+7)), so:

5(f+7)

We multiply parentheses

5f+35

Back to the equation:

-(5f+35)



We get rid of parentheses

-5f-35+100=0

We add all the numbers together, and all the variables

-5f+65=0

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

-5f=-65

f=-65/-5

f=+13

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