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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
15/k = 50/30 // - 50/30
15/k-(50/30) = 0
15/k-5/3 = 0
15*k^-1 = 5/3 // : 15
k^-1 = 1/9
-1 < 0
1/(k^1) = 1/9 // * k^1
1 = 1/9*k^1 // : 1/9
9 = k^1
k = 9
k = 9
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