n n
m + - - n - m - - + n
m m
---------------------
n n
m - - + n + m + - - n
m m
$$\frac{n + \left(\left(- m + \left(- n + \left(m + \frac{n}{m}\right)\right)\right) - \frac{n}{m}\right)}{- n + \left(\left(m + \left(n + \left(m - \frac{n}{m}\right)\right)\right) + \frac{n}{m}\right)}$$