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D( X )
X < 0
X < 0
X in <0:+oo)
X^(3/2) = 75 // - 75
X^(3/2)-75 = 0
1*X^(3/2) = 75 // : 1
X^(3/2) = 75
X^(3/2) = 75 // ^ 2
X^3 = 5625 // ^ 1/3
X = 5*45^(1/3)
X = 5*45^(1/3)
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