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13c+9=18c-11
We move all terms to the left:
13c+9-(18c-11)=0
We get rid of parentheses
13c-18c+11+9=0
We add all the numbers together, and all the variables
-5c+20=0
We move all terms containing c to the left, all other terms to the right
-5c=-20
c=-20/-5
c=+4
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