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12f=13f+18
We move all terms to the left:
12f-(13f+18)=0
We get rid of parentheses
12f-13f-18=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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