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