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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
3.6/k = 0.2/0.5 // - 0.2/0.5
3.6/k-(0.2/0.5) = 0
3.6/k-0.4 = 0
3.6*k^-1 = 0.4 // : 3.6
k^-1 = 0.11111111
-1 < 0
1/(k^1) = 0.11111111 // * k^1
1 = 0.11111111*k^1 // : 0.11111111
9.00000009 = k^1
k = 9.00000009
k = 9.00000009
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