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x in (-oo:+oo)
1/p+1/s = 1/h // - 1/h
1/p-(1/h)+1/s = 0
1/p-h^-1+1/s = 0
p^-1-h^-1+s^-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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