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x in (-oo:+oo)
x/z-1 = (2/3)*x-3 // - (2/3)*x-3
x/z-((2/3)*x)-1+3 = 0
(-2/3)*x+x/z-1+3 = 0
x*z^-1+2 = 0 // - 2
x*z^-1 = -2 // : z^-1
x = -2/(z^-1)
x = -2/(z^-1)
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