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