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4/p = 7/m+5/n // - 7/m+5/n
4/p-(7/m)-(5/n) = 0
4/p-7*m^-1-5*n^-1 = 0
4*p^-1-7*m^-1-5*n^-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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