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D( r )
r < 0
r < 0
r in <0:+oo)
r^(5/2)-(5*r^(3/2)) = 0
r^(5/2)-5*r^(3/2) = 0
r^(5/2)-5*r^(3/2) = 0
r^(3/2)*(r-5) = 0
r-5 = 0 // + 5
r = 5
r^(3/2) = 0
1*r^(3/2) = 0 // : 1
r^(3/2) = 0
r = 0
r in { 5, 0 }
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