Let x=$$\frac{5\frac{3}{4}-\frac{3}{7}\times15\frac{3}{4}+2\frac{2}{35}\div1\frac{11}{25}}{\frac{3}{4}\div5\frac{1}{4}+5\frac{3}{5}\div3\frac{4}{15}}$$. When y is added to  x, the result is $$\frac{7}{13}$$. What is the value of y?

A

$$\frac{1}{13}$$

B

$$\frac{9}{13}$$

C

$$\frac{2}{13}$$

D

$$\frac{4}{13}$$