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3(-+f)2=412
We move all terms to the left:
3(-+f)2-(412)=0
We add all the numbers together, and all the variables
3(+f)2-412=0
We multiply parentheses
6f-412=0
We move all terms containing f to the left, all other terms to the right
6f=412
f=412/6
f=68+2/3
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