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x in (-oo:+oo)
1/f = f*(1/q)+1/p // - f*(1/q)+1/p
1/f-(f*(1/q))-(1/p) = 0
1/f-(f*q^-1)-p^-1 = 0
f^-1-(f*q^-1)-p^-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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