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-9(f+81)+-57=-3
We move all terms to the left:
-9(f+81)+-57-(-3)=0
We add all the numbers together, and all the variables
-9(f+81)-54=0
We multiply parentheses
-9f-729-54=0
We add all the numbers together, and all the variables
-9f-783=0
We move all terms containing f to the left, all other terms to the right
-9f=783
f=783/-9
f=-87
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