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(-5)k-(-12)k-(-6)=(-12)
We move all terms to the left:
(-5)k-(-12)k-(-6)-((-12))=0
We add all the numbers together, and all the variables
(-5)k-(-12)k+18=0
We multiply parentheses
-5k+12k+18=0
We add all the numbers together, and all the variables
7k+18=0
We move all terms containing k to the left, all other terms to the right
7k=-18
k=-18/7
k=-2+4/7
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