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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
10.5/k = 19.5/6.5 // - 19.5/6.5
10.5/k-(19.5/6.5) = 0
10.5/k-3 = 0
10.5*k^-1 = 3 // : 10.5
k^-1 = 0.28571429
-1 < 0
1/(k^1) = 0.28571429 // * k^1
1 = 0.28571429*k^1 // : 0.28571429
3.49999995 = k^1
k = 3.49999995
k = 3.49999995
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