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