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-8c+9=-7c
We move all terms to the left:
-8c+9-(-7c)=0
We get rid of parentheses
-8c+7c+9=0
We add all the numbers together, and all the variables
-1c+9=0
We move all terms containing c to the left, all other terms to the right
-c=-9
c=-9/-1
c=+9
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