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3+(-2f)=9
We move all terms to the left:
3+(-2f)-(9)=0
We add all the numbers together, and all the variables
(-2f)-6=0
We get rid of parentheses
-2f-6=0
We move all terms containing f to the left, all other terms to the right
-2f=6
f=6/-2
f=-3
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