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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
2/1.2 = 5/k // - 5/k
2/1.2-(5/k) = 0
2/1.2-5*k^-1 = 0
-5*k^-1 = -1.66666667 // : -5
k^-1 = 0.33333333
-1 < 0
1/(k^1) = 0.33333333 // * k^1
1 = 0.33333333*k^1 // : 0.33333333
3.00000003 = k^1
k = 3.00000003
k = 3.00000003
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