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x in (-oo:+oo)
h/r = 8/3.1459 // - 8/3.1459
h/r-(8/3.1459) = 0
h/r-2.54299247 = 0
h*r^-1-2.54299247 = 0
x naleu017Cy do R
x in (-oo:+oo)
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