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2c-3=12-2c+7c
We move all terms to the left:
2c-3-(12-2c+7c)=0
We add all the numbers together, and all the variables
2c-(5c+12)-3=0
We get rid of parentheses
2c-5c-12-3=0
We add all the numbers together, and all the variables
-3c-15=0
We move all terms containing c to the left, all other terms to the right
-3c=15
c=15/-3
c=-5
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