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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
-51/k = 65 // - 65
-51/k-65 = 0
-51*k^-1 = 65 // : -51
k^-1 = -65/51
-1 < 0
1/(k^1) = -65/51 // * k^1
1 = -65/51*k^1 // : -65/51
-51/65 = k^1
k = -51/65
k = -51/65
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