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100=c/2-20
We move all terms to the left:
100-(c/2-20)=0
We get rid of parentheses
-c/2+20+100=0
We multiply all the terms by the denominator
-c+20*2+100*2=0
We add all the numbers together, and all the variables
-1c+240=0
We move all terms containing c to the left, all other terms to the right
-c=-240
c=-240/-1
c=+240
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