x+2yy+2x\frac{x+2 y}{y+2 x}y+2xx+2y
2x+yx+2y\frac{2 x+y}{x+2 y}x+2y2x+y
−−2x−yx+2y-\frac{-2 x-y}{x+2 y}−x+2y−2x−y
−x−2yy+2x\frac{-x-2 y}{y+2 x}y+2x−x−2y