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