=\frac{\left(m-1\right)\left(5-2n\right) + \left(7-n\right)\left(m+1\right) + 5}{\left(m+1\right)\left(5-2n\right)} = \frac{3}{2} - \frac{2}{m+1} + \frac{5}{\left(m+1\right)\left(5-2n\right)} + \frac{9}{10-4n}