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-9c=-8c+15
We move all terms to the left:
-9c-(-8c+15)=0
We get rid of parentheses
-9c+8c-15=0
We add all the numbers together, and all the variables
-1c-15=0
We move all terms containing c to the left, all other terms to the right
-c=15
c=15/-1
c=-15
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