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D( x )
4*x < 0
4*x < 0
4*x < 0
4*x+0 < 0 // - 0
4*x < 0 // : 4
x < 0/4
x < 0
x in <0:+oo)
(4*x)^(3/4) = 108 // - 108
(4*x)^(3/4)-108 = 0
4^(3/4)*x^(3/4) = 108 // : 4^(3/4)
x^(3/4) = 108/(4^(3/4))
x^(3/4) = 108/(4^(3/4)) // ^ 4
x^3 = 2125764 // ^ 1/3
x = 81*4^(1/3)
x = 81*4^(1/3)
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