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-3(c+8)+-15=-15
We move all terms to the left:
-3(c+8)+-15-(-15)=0
We add all the numbers together, and all the variables
-3(c+8)=0
We multiply parentheses
-3c-24=0
We move all terms containing c to the left, all other terms to the right
-3c=24
c=24/-3
c=-8
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