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f-54=3f-80
We move all terms to the left:
f-54-(3f-80)=0
We get rid of parentheses
f-3f+80-54=0
We add all the numbers together, and all the variables
-2f+26=0
We move all terms containing f to the left, all other terms to the right
-2f=-26
f=-26/-2
f=+13
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