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-4=2(f-9)
We move all terms to the left:
-4-(2(f-9))=0
We calculate terms in parentheses: -(2(f-9)), so:We get rid of parentheses
2(f-9)
We multiply parentheses
2f-18
Back to the equation:
-(2f-18)
-2f+18-4=0
We add all the numbers together, and all the variables
-2f+14=0
We move all terms containing f to the left, all other terms to the right
-2f=-14
f=-14/-2
f=+7
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