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-1-9c=-8c
We move all terms to the left:
-1-9c-(-8c)=0
We get rid of parentheses
-9c+8c-1=0
We add all the numbers together, and all the variables
-1c-1=0
We move all terms containing c to the left, all other terms to the right
-c=1
c=1/-1
c=-1
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