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