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6c+9=3c-15
We move all terms to the left:
6c+9-(3c-15)=0
We get rid of parentheses
6c-3c+15+9=0
We add all the numbers together, and all the variables
3c+24=0
We move all terms containing c to the left, all other terms to the right
3c=-24
c=-24/3
c=-8
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