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3c+9=3c-3+2c
We move all terms to the left:
3c+9-(3c-3+2c)=0
We add all the numbers together, and all the variables
3c-(5c-3)+9=0
We get rid of parentheses
3c-5c+3+9=0
We add all the numbers together, and all the variables
-2c+12=0
We move all terms containing c to the left, all other terms to the right
-2c=-12
c=-12/-2
c=+6
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