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x in (-oo:+oo)
1/c = 1/n+1/z // - 1/n+1/z
1/c-(1/n)-(1/z) = 0
1/c-n^-1-z^-1 = 0
c^-1-n^-1-z^-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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