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-9(f+54)=81
We move all terms to the left:
-9(f+54)-(81)=0
We multiply parentheses
-9f-486-81=0
We add all the numbers together, and all the variables
-9f-567=0
We move all terms containing f to the left, all other terms to the right
-9f=567
f=567/-9
f=-63
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