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D( x )
x < 0
x < 0
x in <0:+oo)
3*x^(3/4) = 375 // - 375
3*x^(3/4)-375 = 0
3*x^(3/4) = 375 // : 3
x^(3/4) = 125
x^(3/4) = 125 // ^ 4
x^3 = 244140625 // ^ 1/3
x = 625
x = 625
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