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2c=4c-20
We move all terms to the left:
2c-(4c-20)=0
We get rid of parentheses
2c-4c+20=0
We add all the numbers together, and all the variables
-2c+20=0
We move all terms containing c to the left, all other terms to the right
-2c=-20
c=-20/-2
c=+10
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