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3+3f=5f-9
We move all terms to the left:
3+3f-(5f-9)=0
We get rid of parentheses
3f-5f+9+3=0
We add all the numbers together, and all the variables
-2f+12=0
We move all terms containing f to the left, all other terms to the right
-2f=-12
f=-12/-2
f=+6
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