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x in (-oo:+oo)
X = 2.03030303/y // - 2.03030303/y
X-(2.03030303/y) = 0
X-2.03030303*y^-1 = 0
X-2.03030303*y^-1 = 0
x należy do R
x in (-oo:+oo)
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