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D( k )
k < 0
k < 0
k in <0:+oo)
k^(3/2) = 20 // - 20
k^(3/2)-20 = 0
1*k^(3/2) = 20 // : 1
k^(3/2) = 20
k^(3/2) = 20 // ^ 2
k^3 = 400 // ^ 1/3
k = 2*50^(1/3)
k = 2*50^(1/3)
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