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x in (-oo:+oo)
I = 2*r+(2*v)/R // - 2*r+(2*v)/R
I-(2*r)-((2*v)/R) = 0
I-2*r-2*R^-1*v = 0
I-2*r-2*R^-1*v = 0
x naleu017Cy do R
x in (-oo:+oo)
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