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12c+6=13+13c
We move all terms to the left:
12c+6-(13+13c)=0
We add all the numbers together, and all the variables
12c-(13c+13)+6=0
We get rid of parentheses
12c-13c-13+6=0
We add all the numbers together, and all the variables
-1c-7=0
We move all terms containing c to the left, all other terms to the right
-c=7
c=7/-1
c=-7
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