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12+17f=18f-6
We move all terms to the left:
12+17f-(18f-6)=0
We get rid of parentheses
17f-18f+6+12=0
We add all the numbers together, and all the variables
-1f+18=0
We move all terms containing f to the left, all other terms to the right
-f=-18
f=-18/-1
f=+18
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