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3f-6=f+2
We move all terms to the left:
3f-6-(f+2)=0
We get rid of parentheses
3f-f-2-6=0
We add all the numbers together, and all the variables
2f-8=0
We move all terms containing f to the left, all other terms to the right
2f=8
f=8/2
f=4
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