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x in (-oo:+oo)
U-(3/u)-2 = 4/u+4 // - 4/u+4
U-(3/u)-(4/u)-4-2 = 0
U-3*u^-1-4*u^-1-4-2 = 0
U-7*u^-1-6 = 0
x naleu017Cy do R
x in (-oo:+oo)
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