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12f=8f-16
We move all terms to the left:
12f-(8f-16)=0
We get rid of parentheses
12f-8f+16=0
We add all the numbers together, and all the variables
4f+16=0
We move all terms containing f to the left, all other terms to the right
4f=-16
f=-16/4
f=-4
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