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x in (-oo:+oo)
m+n/p = x // - x
m+n/p-x = 0
m+n*p^-1-x = 0 // - m+n*p^-1
-x = -(m+n*p^-1) // * -1
x = m+n*p^-1
x = m+n*p^-1
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