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x in (-oo:+oo)
Y/y-2 = 2/y-2 // - 2/y-2
Y/y-(2/y)-2+2 = 0
Y/y-2*y^-1-2+2 = 0
Y*y^-1-2*y^-1 = 0
x należy do R
x in (-oo:+oo)
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