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8f+6=2f-54
We move all terms to the left:
8f+6-(2f-54)=0
We get rid of parentheses
8f-2f+54+6=0
We add all the numbers together, and all the variables
6f+60=0
We move all terms containing f to the left, all other terms to the right
6f=-60
f=-60/6
f=-10
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