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D( x )
x < 0
x < 0
x in <0:+oo)
(7/2)*x^(5/2)-(16*x) = 0
(7/2)*x^(5/2)-16*x = 0
7/2*x^(5/2)-16*x = 0
x*(7/2*x^(3/2)-16) = 0
7/2*x^(3/2) = 16 // : 7/2
x^(3/2) = 32/7
x^(3/2) = 32/7 // ^ 2
x^3 = 1024/49 // ^ 1/3
x = (1024/49)^(1/3)
x = 0
x = 0
x in { (1024/49)^(1/3), 0 }
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