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D( x )
x^4 = 0
x^3 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
2/(x^3)-(6/(x^4)) = 0
2/(x^3)-6*x^-4 = 0
2*x^-3-6*x^-4 = 0
(2*x^1-6*x^0)/(x^4) = 0 // * x^8
x^4*(2*x^1-6*x^0) = 0
x^4
2*x-6 = 0
2*x^1 = 6 // : 2
x^1 = 3
x = 3
x in { 3}
x = 3
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