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-9c+18c+11c-2c+-19c=-8
We move all terms to the left:
-9c+18c+11c-2c+-19c-(-8)=0
We add all the numbers together, and all the variables
-1c+8=0
We move all terms containing c to the left, all other terms to the right
-c=-8
c=-8/-1
c=+8
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