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420=29f-83
We move all terms to the left:
420-(29f-83)=0
We get rid of parentheses
-29f+83+420=0
We add all the numbers together, and all the variables
-29f+503=0
We move all terms containing f to the left, all other terms to the right
-29f=-503
f=-503/-29
f=17+10/29
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