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-12c-9=-11c+9-15
We move all terms to the left:
-12c-9-(-11c+9-15)=0
We add all the numbers together, and all the variables
-12c-(-11c-6)-9=0
We get rid of parentheses
-12c+11c+6-9=0
We add all the numbers together, and all the variables
-1c-3=0
We move all terms containing c to the left, all other terms to the right
-c=3
c=3/-1
c=-3
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