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2c-9=9+4c
We move all terms to the left:
2c-9-(9+4c)=0
We add all the numbers together, and all the variables
2c-(4c+9)-9=0
We get rid of parentheses
2c-4c-9-9=0
We add all the numbers together, and all the variables
-2c-18=0
We move all terms containing c to the left, all other terms to the right
-2c=18
c=18/-2
c=-9
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