$$2- \frac{ x }{ x+2y }$$
$\frac{x+4y}{x+2y}$
$$\frac{2\left(x+2y\right)}{x+2y}-\frac{x}{x+2y}$$
$$\frac{2\left(x+2y\right)-x}{x+2y}$$
$$\frac{2x+4y-x}{x+2y}$$
$$\frac{x+4y}{x+2y}$$
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$-\frac{2y}{\left(x+2y\right)^{2}}$