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4f-1=-3f-8
We move all terms to the left:
4f-1-(-3f-8)=0
We get rid of parentheses
4f+3f+8-1=0
We add all the numbers together, and all the variables
7f+7=0
We move all terms containing f to the left, all other terms to the right
7f=-7
f=-7/7
f=-1
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