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D( x )
x < 0
x < 0
x in <0:+oo)
0 = 3*x-x^(3/2) // - 3*x-x^(3/2)
x^(3/2)-(3*x)+0 = 0
x^(3/2)-3*x = 0
x^(3/2)-3*x = 0
x*(x^(1/2)-3) = 0
1*x^(1/2) = 3 // : 1
x^(1/2) = 3
x^(1/2) = 3 // ^ 2
x = 9
x = 0
x = 0
x in { 9, 0 }
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