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42=2+8f
We move all terms to the left:
42-(2+8f)=0
We add all the numbers together, and all the variables
-(8f+2)+42=0
We get rid of parentheses
-8f-2+42=0
We add all the numbers together, and all the variables
-8f+40=0
We move all terms containing f to the left, all other terms to the right
-8f=-40
f=-40/-8
f=+5
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