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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)
8*x-(6/(x^4)) = 0
8*x-6*x^-4 = 0
8*x-6*x^-4 = 0
2*x*(4-3*x^-5) = 0
-3*x^-5 = -4 // : -3
x^-5 = 4/3
-5 < 0
1/(x^5) = 4/3 // * x^5
1 = 4/3*x^5 // : 4/3
3/4 = x^5
x^5 = 3/4 // ^ 1/5
x = (3/4)^(1/5)
2*x = 0
2*x = 0 // : 2
x = 0
x in { 0}
x = (3/4)^(1/5)
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