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