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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
49/k-3 = 46 // - 46
49/k-46-3 = 0
49*k^-1 = 49 // : 49
k^-1 = 1
-1 < 0
1/(k^1) = 1 // * k^1
1 = 1*k^1 // : 1
1 = k^1
k = 1
k = 1
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