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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9*x^4)/x+4 = 0
9*x^3 = -4 // : 9
x^3 = -4/9
x^3 = -4/9 // ^ 1/3
x = -(4/9)^(1/3)
x = -(4/9)^(1/3)
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