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7c-(3c-9)=c-6
We move all terms to the left:
7c-(3c-9)-(c-6)=0
We get rid of parentheses
7c-3c-c+9+6=0
We add all the numbers together, and all the variables
3c+15=0
We move all terms containing c to the left, all other terms to the right
3c=-15
c=-15/3
c=-5
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