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7c+10-12c=-11-2c
We move all terms to the left:
7c+10-12c-(-11-2c)=0
We add all the numbers together, and all the variables
7c-12c-(-2c-11)+10=0
We add all the numbers together, and all the variables
-5c-(-2c-11)+10=0
We get rid of parentheses
-5c+2c+11+10=0
We add all the numbers together, and all the variables
-3c+21=0
We move all terms containing c to the left, all other terms to the right
-3c=-21
c=-21/-3
c=+7
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