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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)
y^-1*((x^2*y^3*z)/(x^4))*z^5-4 = 0
x^-2*y^2*z^6 = 4 // : y^2*z^6
x^-2 = 4/(y^2*z^6)
-2 < 0
1/(x^2) = 4/(y^2*z^6) // * x^2
1 = x^2*(4/(y^2*z^6)) // : 4/(y^2*z^6)
1/(4/(y^2*z^6)) = x^2
x^2 = 1/(4/(y^2*z^6)) // ^ 1/2
abs(x) = 1/(2/(y*z^3))
x = 1/(2/(y*z^3)) or x = -(1/(2/(y*z^3)))
x in { 1/(2/(y*z^3)), -(1/(2/(y*z^3))) }
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