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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 2*y-z // - 2*y-z
1/x-(2*y)+z = 0
1/x-2*y+z = 0
1*x^-1 = -(z-2*y) // : 1
x^-1 = -(z-2*y)
-1 < 0
1/(x^1) = -(z-2*y) // * x^1
1 = x^1*(-(z-2*y)) // : -(z-2*y)
-(z-2*y)^-1 = x^1
x = (z-2*y)^-1
x = (z-2*y)^-1
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