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x in (-oo:+oo)
Y-(4/y)-5 = y-(3/y)+1+1 // - y-(3/y)+1+1
Y-y-(4/y)+3/y-5-1-1 = 0
Y-y-4*y^-1+3/y-5-1-1 = 0
Y-y-y^-1-7 = 0
x naleu017Cy do R
x in (-oo:+oo)
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