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