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12f-5=4f+3
We move all terms to the left:
12f-5-(4f+3)=0
We get rid of parentheses
12f-4f-3-5=0
We add all the numbers together, and all the variables
8f-8=0
We move all terms containing f to the left, all other terms to the right
8f=8
f=8/8
f=1
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