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D( j )
j < 0
j < 0
j in <0:+oo)
2*j^(5/2) = -64 // + 64
2*j^(5/2)+64 = 0
2*j^(5/2) = -64 // : 2
j^(5/2) = -32
j^(5/2) = -32 // ^ 2
j^5 = 1024 // ^ 1/5
j = 4
j = 4
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