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-c+9-5c=-9c-9
We move all terms to the left:
-c+9-5c-(-9c-9)=0
We add all the numbers together, and all the variables
-6c-(-9c-9)+9=0
We get rid of parentheses
-6c+9c+9+9=0
We add all the numbers together, and all the variables
3c+18=0
We move all terms containing c to the left, all other terms to the right
3c=-18
c=-18/3
c=-6
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