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-6f+3=2f-21
We move all terms to the left:
-6f+3-(2f-21)=0
We get rid of parentheses
-6f-2f+21+3=0
We add all the numbers together, and all the variables
-8f+24=0
We move all terms containing f to the left, all other terms to the right
-8f=-24
f=-24/-8
f=+3
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