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12c+7=15+10c
We move all terms to the left:
12c+7-(15+10c)=0
We add all the numbers together, and all the variables
12c-(10c+15)+7=0
We get rid of parentheses
12c-10c-15+7=0
We add all the numbers together, and all the variables
2c-8=0
We move all terms containing c to the left, all other terms to the right
2c=8
c=8/2
c=4
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