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