$$\frac{10}{x + y} - \frac{9}{x - y} = 2; \frac{6}{x + y} + \frac{15}{x - y} = 8 \Rightarrow 2x + 3y =$$

A

$$-\frac{5}{2}$$

B

$$\frac{5}{2}$$

C

$$\frac{7}{2}$$

D

$$-\frac{7}{2}$$