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43f=23f+12
We move all terms to the left:
43f-(23f+12)=0
We get rid of parentheses
43f-23f-12=0
We add all the numbers together, and all the variables
20f-12=0
We move all terms containing f to the left, all other terms to the right
20f=12
f=12/20
f=3/5
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