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12=2(f-83)
We move all terms to the left:
12-(2(f-83))=0
We calculate terms in parentheses: -(2(f-83)), so:We get rid of parentheses
2(f-83)
We multiply parentheses
2f-166
Back to the equation:
-(2f-166)
-2f+166+12=0
We add all the numbers together, and all the variables
-2f+178=0
We move all terms containing f to the left, all other terms to the right
-2f=-178
f=-178/-2
f=+89
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