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6(k-1)=-18
We move all terms to the left:
6(k-1)-(-18)=0
We add all the numbers together, and all the variables
6(k-1)+18=0
We multiply parentheses
6k-6+18=0
We add all the numbers together, and all the variables
6k+12=0
We move all terms containing k to the left, all other terms to the right
6k=-12
k=-12/6
k=-2
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