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2c+40=5c+7
We move all terms to the left:
2c+40-(5c+7)=0
We get rid of parentheses
2c-5c-7+40=0
We add all the numbers together, and all the variables
-3c+33=0
We move all terms containing c to the left, all other terms to the right
-3c=-33
c=-33/-3
c=+11
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