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15f-12=12f+33
We move all terms to the left:
15f-12-(12f+33)=0
We get rid of parentheses
15f-12f-33-12=0
We add all the numbers together, and all the variables
3f-45=0
We move all terms containing f to the left, all other terms to the right
3f=45
f=45/3
f=15
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