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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
0 = 3*x^(-5/2)-3 // - 3*x^(-5/2)-3
0-(3*x^(-5/2))+3 = 0
0-3*x^(-5/2)+3 = 0
-3*x^(-5/2) = -3 // : -3
x^(-5/2) = 1
-5/2 < 0
1/(x^(5/2)) = 1 // * x^(5/2)
1 = 1*x^(5/2) // : 1
1 = x^(5/2)
x^(5/2) = 1 // ^ 2
x^5 = 1 // ^ 1/5
x = 1
x = 1
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