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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)
5/(x^4)-6 = 0
5*x^-4 = 6 // : 5
x^-4 = 6/5
-4 < 0
1/(x^4) = 6/5 // * x^4
1 = 6/5*x^4 // : 6/5
5/6 = x^4
x^4 = 5/6 // ^ 1/4
abs(x) = (5/6)^(1/4)
x = (5/6)^(1/4) or x = -(5/6)^(1/4)
x in { (5/6)^(1/4), -(5/6)^(1/4) }
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