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D( x )
x < 0
x^1.29 = 0
x < 0
x^1.29 = 0
x^1.29 = 0
1*x^1.29 = 0 // : 1
x^1.29 = 0
x = 0
x in (0:+oo)
y/(x^1.29) = 54000 // - 54000
y/(x^1.29)-54000 = 0
x^-1.29*y = 54000 // : y
x^-1.29 = 54000/y
-1.29 < 0
1/(x^1.29) = 54000/y // * x^1.29
1 = x^1.29*(54000/y) // : 54000/y
1/(54000/y) = x^1.29
x = (1/(54000/y))^(1/0.29)
x = (1/(54000/y))^(1/0.29)
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