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x in (-oo:+oo)
A = h*(f+g/z) // - h*(f+g/z)
A-(h*(f+g/z)) = 0
A-1*h*(f+g*z^-1) = 0
A-1*h*(f+g*z^-1) = 0
A-(f*h)-(g*h*z^-1) = 0
A-(f*h)-(g*h*z^-1) = 0
x belongs to the empty set
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