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20=4f+38
We move all terms to the left:
20-(4f+38)=0
We get rid of parentheses
-4f-38+20=0
We add all the numbers together, and all the variables
-4f-18=0
We move all terms containing f to the left, all other terms to the right
-4f=18
f=18/-4
f=-4+1/2
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