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8f=6f-8
We move all terms to the left:
8f-(6f-8)=0
We get rid of parentheses
8f-6f+8=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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