12. 已知x>0x>0x>0,y>0y>0y>0,且x+2y=2x+2y=2x+2y=2,则4x+x+3y3y\frac{4}{x}+\frac{x+3y}{3y}x4+3yx+3y的最小值为 ___3+4333+\frac{4\sqrt{3}}{3}3+343___.