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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
9/k = -(3/20) // + 3/20
9/k+3/20 = 0
9*k^-1 = -3/20 // : 9
k^-1 = -1/60
-1 < 0
1/(k^1) = -1/60 // * k^1
1 = -1/60*k^1 // : -1/60
-60 = k^1
k = -60
k = -60
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