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-2(12-3c)=-66=c
We move all terms to the left:
-2(12-3c)-(-66)=0
We add all the numbers together, and all the variables
-2(-3c+12)-(-66)=0
We add all the numbers together, and all the variables
-2(-3c+12)+66=0
We multiply parentheses
6c-24+66=0
We add all the numbers together, and all the variables
6c+42=0
We move all terms containing c to the left, all other terms to the right
6c=-42
c=-42/6
c=-7
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