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92=9f+20
We move all terms to the left:
92-(9f+20)=0
We get rid of parentheses
-9f-20+92=0
We add all the numbers together, and all the variables
-9f+72=0
We move all terms containing f to the left, all other terms to the right
-9f=-72
f=-72/-9
f=+8
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