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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (-6*x^9)/(x^2)-16 // - (-6*x^9)/(x^2)-16
y-((-6*x^9)/(x^2))+16 = 0
6*x^7+y+16 = 0
6*x^7 = -(y+16) // : 6
x^7 = (-(y+16))/6
x^7 = (-(y+16))/6 // ^ 1/7
x = (-(y+16)^(1/7))/(6^(1/7))
x = (-(y+16)^(1/7))/(6^(1/7))
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