−(y+2x)(2y+x)\frac{-(y+2 x)}{(2 y+x)}(2y+x)−(y+2x)
(y+2x)(2y+x)\frac{(y+2 x)}{(2 y+x)}(2y+x)(y+2x)
−(2y+x)(y+2x)\frac{-(2 y+x)}{(y+2 x)}(y+2x)−(2y+x)
000