Ответ В

[tex] \frac{2m - n}{3m + 2n} \\ m = 4 \\ n = - 5 \\ \frac{2 \times 4 - ( - 5)}{3 \times 4 + 2 \times ( - 5)} = \frac{8 + 5}{12 - 10} = \frac{13}{2} = 6.5[/tex]