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6c=-9-3c
We move all terms to the left:
6c-(-9-3c)=0
We add all the numbers together, and all the variables
6c-(-3c-9)=0
We get rid of parentheses
6c+3c+9=0
We add all the numbers together, and all the variables
9c+9=0
We move all terms containing c to the left, all other terms to the right
9c=-9
c=-9/9
c=-1
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