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7f+4=12+3f
We move all terms to the left:
7f+4-(12+3f)=0
We add all the numbers together, and all the variables
7f-(3f+12)+4=0
We get rid of parentheses
7f-3f-12+4=0
We add all the numbers together, and all the variables
4f-8=0
We move all terms containing f to the left, all other terms to the right
4f=8
f=8/4
f=2
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