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100=4(f+8)
We move all terms to the left:
100-(4(f+8))=0
We calculate terms in parentheses: -(4(f+8)), so:We get rid of parentheses
4(f+8)
We multiply parentheses
4f+32
Back to the equation:
-(4f+32)
-4f-32+100=0
We add all the numbers together, and all the variables
-4f+68=0
We move all terms containing f to the left, all other terms to the right
-4f=-68
f=-68/-4
f=+17
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