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D( x )
x^2-9 = 0
x^2-9 = 0
x^2-9 = 0
1*x^2 = 9 // : 1
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in (-oo:-3) U (-3:3) U (3:+oo)
(x*((5*x^2)/14)-3)/(x^2-9) = 0
(5/14*x^3-3)/(x^2-9) = 0
5/14*x^3 = 3 // : 5/14
x^3 = 42/5
x^3 = 42/5 // ^ 1/3
x = (42/5)^(1/3)
x = (42/5)^(1/3)
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