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3c=4c+9
We move all terms to the left:
3c-(4c+9)=0
We get rid of parentheses
3c-4c-9=0
We add all the numbers together, and all the variables
-1c-9=0
We move all terms containing c to the left, all other terms to the right
-c=9
c=9/-1
c=-9
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