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511=c/30-500
We move all terms to the left:
511-(c/30-500)=0
We get rid of parentheses
-c/30+500+511=0
We multiply all the terms by the denominator
-c+500*30+511*30=0
We add all the numbers together, and all the variables
-1c+30330=0
We move all terms containing c to the left, all other terms to the right
-c=-30330
c=-30330/-1
c=+30330
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