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2+15f=18f+17
We move all terms to the left:
2+15f-(18f+17)=0
We get rid of parentheses
15f-18f-17+2=0
We add all the numbers together, and all the variables
-3f-15=0
We move all terms containing f to the left, all other terms to the right
-3f=15
f=15/-3
f=-5
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