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3f+2=7f-6
We move all terms to the left:
3f+2-(7f-6)=0
We get rid of parentheses
3f-7f+6+2=0
We add all the numbers together, and all the variables
-4f+8=0
We move all terms containing f to the left, all other terms to the right
-4f=-8
f=-8/-4
f=+2
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