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3f+9=4f-47
We move all terms to the left:
3f+9-(4f-47)=0
We get rid of parentheses
3f-4f+47+9=0
We add all the numbers together, and all the variables
-1f+56=0
We move all terms containing f to the left, all other terms to the right
-f=-56
f=-56/-1
f=+56
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