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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)
X^5-(7*x^3)-((9*x^2)/(x^2)) = 0
X^5-7*x^3-9 = 0
-7*x^3 = -(X^5-9) // : -7
x^3 = (9-X^5)/(-7)
x^3 = (9-X^5)/(-7) // ^ 1/3
x = ((9-X^5)^(1/3))/(-7^(1/3))
x = ((9-X^5)^(1/3))/(-7^(1/3))
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