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D( x )
x = 0
x^2 = 0
x = 0
x = 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/x+1)*(5*x+x+5/(x^2)) = 0
2*(6*x+5*x^-2) = 0
6*x+5*x^-2 = 0
x*(5*x^-3+6) = 0
5*x^-3 = -6 // : 5
x^-3 = -6/5
-3 < 0
1/(x^3) = -6/5 // * x^3
1 = -6/5*x^3 // : -6/5
-5/6 = x^3
x^3 = -5/6 // ^ 1/3
x = -(5/6)^(1/3)
x*(x+(5/6)^(1/3)) = 0
2*x*(x+(5/6)^(1/3)) = 0
( x+(5/6)^(1/3) )
x+(5/6)^(1/3) = 0 // - (5/6)^(1/3)
x = -(5/6)^(1/3)
( x )
x = 0
x in { 0}
x = -(5/6)^(1/3)
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