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13f+3=15f-3
We move all terms to the left:
13f+3-(15f-3)=0
We get rid of parentheses
13f-15f+3+3=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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