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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4/k+6 = 10/9 // - 10/9
4/k-(10/9)+6 = 0
4/k-10/9+6 = 0
4*k^-1 = -44/9 // : 4
k^-1 = -11/9
-1 < 0
1/(k^1) = -11/9 // * k^1
1 = -11/9*k^1 // : -11/9
-9/11 = k^1
k = -9/11
k = -9/11
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