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6(-k-3)=12
We move all terms to the left:
6(-k-3)-(12)=0
We add all the numbers together, and all the variables
6(-1k-3)-12=0
We multiply parentheses
-6k-18-12=0
We add all the numbers together, and all the variables
-6k-30=0
We move all terms containing k to the left, all other terms to the right
-6k=30
k=30/-6
k=-5
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