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20f+50=10f-80
We move all terms to the left:
20f+50-(10f-80)=0
We get rid of parentheses
20f-10f+80+50=0
We add all the numbers together, and all the variables
10f+130=0
We move all terms containing f to the left, all other terms to the right
10f=-130
f=-130/10
f=-13
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