[tex] \frac{5 {m}^{2} - 3mk}{ {m}^{2} } = \frac{m(5m - 3k)}{m {}^{2} } = \frac{5m - 3k}{m} = \\ \frac{5 \times 0.75 - 3 \times ( - 2)}{ - 2} = - \frac{3.75 + 6}{ 2} = \\ - \frac{9.75}{2} = - 4.875[/tex]