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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
6/k = -1.5 // + 1.5
6/k+1.5 = 0
6*k^-1 = -1.5 // : 6
k^-1 = -0.25
-1 < 0
1/(k^1) = -0.25 // * k^1
1 = -0.25*k^1 // : -0.25
-4 = k^1
k = -4
k = -4
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