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17f-18=18f-14
We move all terms to the left:
17f-18-(18f-14)=0
We get rid of parentheses
17f-18f+14-18=0
We add all the numbers together, and all the variables
-1f-4=0
We move all terms containing f to the left, all other terms to the right
-f=4
f=4/-1
f=-4
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