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6c-c=-12-3
We move all terms to the left:
6c-c-(-12-3)=0
We add all the numbers together, and all the variables
6c-c-(-15)=0
We add all the numbers together, and all the variables
5c+15=0
We move all terms containing c to the left, all other terms to the right
5c=-15
c=-15/5
c=-3
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