If $$\frac{a}{b} = \frac{7}{6}$$, then find the value of the expression $$\frac{6a + 13b}{6a - 13b}$$.

A

$$-\frac{3}{10}$$

B

$$\frac{10}{3}$$

C

$$-\frac{10}{3}$$

D

$$\frac{3}{10}$$