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9f-18=12+4f
We move all terms to the left:
9f-18-(12+4f)=0
We add all the numbers together, and all the variables
9f-(4f+12)-18=0
We get rid of parentheses
9f-4f-12-18=0
We add all the numbers together, and all the variables
5f-30=0
We move all terms containing f to the left, all other terms to the right
5f=30
f=30/5
f=6
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