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3+6c=7c+9
We move all terms to the left:
3+6c-(7c+9)=0
We get rid of parentheses
6c-7c-9+3=0
We add all the numbers together, and all the variables
-1c-6=0
We move all terms containing c to the left, all other terms to the right
-c=6
c=6/-1
c=-6
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