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4f-3=-2f+15
We move all terms to the left:
4f-3-(-2f+15)=0
We get rid of parentheses
4f+2f-15-3=0
We add all the numbers together, and all the variables
6f-18=0
We move all terms containing f to the left, all other terms to the right
6f=18
f=18/6
f=3
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