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29=f/31
We move all terms to the left:
29-(f/31)=0
We add all the numbers together, and all the variables
-(+f/31)+29=0
We get rid of parentheses
-f/31+29=0
We multiply all the terms by the denominator
-f+29*31=0
We add all the numbers together, and all the variables
-1f+899=0
We move all terms containing f to the left, all other terms to the right
-f=-899
f=-899/-1
f=+899
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