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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)
0 = (-3*x^9)/(x^2)-16 // - (-3*x^9)/(x^2)-16
0-((-3*x^9)/(x^2))+16 = 0
3*x^7+0+16 = 0
3*x^7 = -16 // : 3
x^7 = -16/3
x^7 = -16/3 // ^ 1/7
x = -(16/3)^(1/7)
x = -(16/3)^(1/7)
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