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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
2/k = -4 // + 4
2/k+4 = 0
2*k^-1 = -4 // : 2
k^-1 = -2
-1 < 0
1/(k^1) = -2 // * k^1
1 = -2*k^1 // : -2
-1/2 = k^1
k = -1/2
k = -1/2
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