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6f+8=3f-12
We move all terms to the left:
6f+8-(3f-12)=0
We get rid of parentheses
6f-3f+12+8=0
We add all the numbers together, and all the variables
3f+20=0
We move all terms containing f to the left, all other terms to the right
3f=-20
f=-20/3
f=-6+2/3
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