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x in (-oo:+oo)
1/r = 1/t+1/5 // - 1/t+1/5
1/r-(1/t)-(1/5) = 0
1/r-t^-1-1/5 = 0
r^-1-t^-1-1/5 = 0
x naleu017Cy do R
x in (-oo:+oo)
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