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x in (-oo:+oo)
p = 4/n-c+2*r // - 4/n-c+2*r
c-(4/n)+p-(2*r) = 0
c-4*n^-1+p-2*r = 0
c-4*n^-1+p-2*r = 0
x naleu017Cy do R
x in (-oo:+oo)
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