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D( x )
x < 0
x < 0
x in <0:+oo)
x^(3/4) = 15 // - 15
x^(3/4)-15 = 0
1*x^(3/4) = 15 // : 1
x^(3/4) = 15
x^(3/4) = 15 // ^ 4
x^3 = 50625 // ^ 1/3
x = 15*15^(1/3)
x = 15*15^(1/3)
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