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D( x )
x^4 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(9*x-(2*x^7))/(x^4) = 0
(9*x-2*x^7)/(x^4) = 0
9*x-2*x^7 = 0
x*(9-2*x^6) = 0
-2*x^6 = -9 // : -2
x^6 = 9/2
x^6 = 9/2 // ^ 1/6
abs(x) = (9/2)^(1/6)
x = (9/2)^(1/6) or x = -(9/2)^(1/6)
x*(x-(9/2)^(1/6))*(x+(9/2)^(1/6)) = 0
(x*(x-(9/2)^(1/6))*(x+(9/2)^(1/6)))/(x^4) = 0
( x+(9/2)^(1/6) )
x+(9/2)^(1/6) = 0 // - (9/2)^(1/6)
x = -(9/2)^(1/6)
( x-(9/2)^(1/6) )
x-(9/2)^(1/6) = 0 // + (9/2)^(1/6)
x = (9/2)^(1/6)
( x )
x = 0
x in { 0}
x in { -(9/2)^(1/6), (9/2)^(1/6) }
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