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20=10(f-91)
We move all terms to the left:
20-(10(f-91))=0
We calculate terms in parentheses: -(10(f-91)), so:We get rid of parentheses
10(f-91)
We multiply parentheses
10f-910
Back to the equation:
-(10f-910)
-10f+910+20=0
We add all the numbers together, and all the variables
-10f+930=0
We move all terms containing f to the left, all other terms to the right
-10f=-930
f=-930/-10
f=+93
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