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D( x )
x < 0
x < 0
x in <0:+oo)
x^(3/2) = 1331 // - 1331
x^(3/2)-1331 = 0
1*x^(3/2) = 1331 // : 1
x^(3/2) = 1331
x^(3/2) = 1331 // ^ 2
x^3 = 1771561 // ^ 1/3
x = 121
x = 121
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