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-3(c+-3)=12
We move all terms to the left:
-3(c+-3)-(12)=0
We add all the numbers together, and all the variables
-3(c-3)-12=0
We multiply parentheses
-3c+9-12=0
We add all the numbers together, and all the variables
-3c-3=0
We move all terms containing c to the left, all other terms to the right
-3c=3
c=3/-3
c=-1
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