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10+2c+7c=-8+3c
We move all terms to the left:
10+2c+7c-(-8+3c)=0
We add all the numbers together, and all the variables
2c+7c-(3c-8)+10=0
We add all the numbers together, and all the variables
9c-(3c-8)+10=0
We get rid of parentheses
9c-3c+8+10=0
We add all the numbers together, and all the variables
6c+18=0
We move all terms containing c to the left, all other terms to the right
6c=-18
c=-18/6
c=-3
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