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12(-3c+-4c)+12=180
We move all terms to the left:
12(-3c+-4c)+12-(180)=0
We add all the numbers together, and all the variables
12(-7c)+12-180=0
We add all the numbers together, and all the variables
12(-7c)-168=0
We multiply parentheses
-84c-168=0
We move all terms containing c to the left, all other terms to the right
-84c=168
c=168/-84
c=-2
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