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18f+4=12f+34
We move all terms to the left:
18f+4-(12f+34)=0
We get rid of parentheses
18f-12f-34+4=0
We add all the numbers together, and all the variables
6f-30=0
We move all terms containing f to the left, all other terms to the right
6f=30
f=30/6
f=5
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