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-9(c+8)=-99
We move all terms to the left:
-9(c+8)-(-99)=0
We add all the numbers together, and all the variables
-9(c+8)+99=0
We multiply parentheses
-9c-72+99=0
We add all the numbers together, and all the variables
-9c+27=0
We move all terms containing c to the left, all other terms to the right
-9c=-27
c=-27/-9
c=+3
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