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3(2f+4)=42
We move all terms to the left:
3(2f+4)-(42)=0
We multiply parentheses
6f+12-42=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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