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x in (-oo:+oo)
Y-(3/y)-1 = y-(1/y)+3 // - y-(1/y)+3
Y-y-(3/y)+1/y-3-1 = 0
Y-y-3*y^-1+1/y-3-1 = 0
Y-y-2*y^-1-4 = 0
x naleu017Cy do R
x in (-oo:+oo)
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