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4f-16=20f-18
We move all terms to the left:
4f-16-(20f-18)=0
We get rid of parentheses
4f-20f+18-16=0
We add all the numbers together, and all the variables
-16f+2=0
We move all terms containing f to the left, all other terms to the right
-16f=-2
f=-2/-16
f=1/8
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