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-12+11c=4c+9c+18
We move all terms to the left:
-12+11c-(4c+9c+18)=0
We add all the numbers together, and all the variables
11c-(13c+18)-12=0
We get rid of parentheses
11c-13c-18-12=0
We add all the numbers together, and all the variables
-2c-30=0
We move all terms containing c to the left, all other terms to the right
-2c=30
c=30/-2
c=-15
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