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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
1.5/k = 21 // - 21
1.5/k-21 = 0
1.5*k^-1 = 21 // : 1.5
k^-1 = 14
-1 < 0
1/(k^1) = 14 // * k^1
1 = 14*k^1 // : 14
1/14 = k^1
k = 1/14
k = 1/14
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