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80=4(f-79)
We move all terms to the left:
80-(4(f-79))=0
We calculate terms in parentheses: -(4(f-79)), so:We get rid of parentheses
4(f-79)
We multiply parentheses
4f-316
Back to the equation:
-(4f-316)
-4f+316+80=0
We add all the numbers together, and all the variables
-4f+396=0
We move all terms containing f to the left, all other terms to the right
-4f=-396
f=-396/-4
f=+99
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