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20=3f+8
We move all terms to the left:
20-(3f+8)=0
We get rid of parentheses
-3f-8+20=0
We add all the numbers together, and all the variables
-3f+12=0
We move all terms containing f to the left, all other terms to the right
-3f=-12
f=-12/-3
f=+4
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