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D( z )
z < 0
z < 0
z in <0:+oo)
z^(7/2) = 5 // - 5
z^(7/2)-5 = 0
1*z^(7/2) = 5 // : 1
z^(7/2) = 5
z^(7/2) = 5 // ^ 2
z^7 = 25 // ^ 1/7
z = 25^(1/7)
z = 25^(1/7)
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