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k in (-oo:+oo)
-6 = -(k/3)-2 // + -(k/3)-2
k/3-6+2 = 0
1/3*k-4 = 0 // + 4
1/3*k = 4 // : 1/3
k = 4/1/3
k = 12
k = 12
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