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x in (-oo:+oo)
r = (p^1-p^0)/(p^0) // - (p^1-p^0)/(p^0)
r-((p^1-p^0)/(p^0)) = 0
r-p-1 = 0
r-p-1 = 0
x należy do R
x in (-oo:+oo)
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