If $$3 of 5\div 2 + \frac{3x}{1+\frac{12}{2+\frac{2x}{1-x}}} = 12\frac{1}{2}$$, what is the value of $$x$$?

A

$$\frac{35}{33}$$

B

$$\frac{25}{13}$$

C

$$\frac{34}{33}$$

D

$$\frac{15}{11}$$