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6f+12=4f-8
We move all terms to the left:
6f+12-(4f-8)=0
We get rid of parentheses
6f-4f+8+12=0
We add all the numbers together, and all the variables
2f+20=0
We move all terms containing f to the left, all other terms to the right
2f=-20
f=-20/2
f=-10
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