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x in (-oo:+oo)
f = 9*y-(m/y) // - 9*y-(m/y)
f+m/y-(9*y) = 0
f+m/y-9*y = 0
f+m*y^-1-9*y = 0
x naleu017Cy do R
x in (-oo:+oo)
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