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x in (-oo:+oo)
r^2*y-3 = 6-((2*y)/3) // - 6-((2*y)/3)
r^2*y+(2*y)/3-6-3 = 0
r^2*y+2/3*y-9 = 0
x naleu017Cy do R
x in (-oo:+oo)
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