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4f-9=2f+15
We move all terms to the left:
4f-9-(2f+15)=0
We get rid of parentheses
4f-2f-15-9=0
We add all the numbers together, and all the variables
2f-24=0
We move all terms containing f to the left, all other terms to the right
2f=24
f=24/2
f=12
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