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f-10=3f-4
We move all terms to the left:
f-10-(3f-4)=0
We get rid of parentheses
f-3f+4-10=0
We add all the numbers together, and all the variables
-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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