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30+c=5c-20
We move all terms to the left:
30+c-(5c-20)=0
We get rid of parentheses
c-5c+20+30=0
We add all the numbers together, and all the variables
-4c+50=0
We move all terms containing c to the left, all other terms to the right
-4c=-50
c=-50/-4
c=12+1/2
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