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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
80/48 = 100/k // - 100/k
80/48-(100/k) = 0
80/48-100*k^-1 = 0
-100*k^-1 = -5/3 // : -100
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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