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12-3f=3f-4
We move all terms to the left:
12-3f-(3f-4)=0
We get rid of parentheses
-3f-3f+4+12=0
We add all the numbers together, and all the variables
-6f+16=0
We move all terms containing f to the left, all other terms to the right
-6f=-16
f=-16/-6
f=2+2/3
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