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15-2c=12-c
We move all terms to the left:
15-2c-(12-c)=0
We add all the numbers together, and all the variables
-2c-(-1c+12)+15=0
We get rid of parentheses
-2c+1c-12+15=0
We add all the numbers together, and all the variables
-1c+3=0
We move all terms containing c to the left, all other terms to the right
-c=-3
c=-3/-1
c=+3
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