Simplify (2x)/(y^2-x^2)-x/(y-x)

$\frac{2 x}{y^{2} - x^{2}} - \frac{x}{y - x}$

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = y$ and $b = x$ .

$\frac{2 x}{(y + x) (y - x)} - \frac{x}{y - x}$

To write $- \frac{x}{y - x}$ as a fraction with a common denominator, multiply by $\frac{y + x}{y + x}$ .

$\frac{2 x}{(y + x) (y - x)} - \frac{x}{y - x} \cdot \frac{y + x}{y + x}$

Write each expression with a common denominator of $(y + x) (y - x)$ , by multiplying each by an appropriate factor of $1$ .

Multiply $\frac{x}{y - x}$ by $\frac{y + x}{y + x}$ .

$\frac{2 x}{(y + x) (y - x)} - \frac{x (y + x)}{(y - x) (y + x)}$

Reorder the factors of $(y - x) (y + x)$ .

$\frac{2 x}{(y + x) (y - x)} - \frac{x (y + x)}{(y + x) (y - x)}$

Combine the numerators over the common denominator.

$\frac{2 x - x (y + x)}{(y + x) (y - x)}$

Simplify the numerator.

Factor $x$ out of $2 x - x (y + x)$ .

Factor $x$ out of $2 x$ .

$\frac{x \cdot 2 - x (y + x)}{(y + x) (y - x)}$

Factor $x$ out of $- x (y + x)$ .

$\frac{x \cdot 2 + x (- (y + x))}{(y + x) (y - x)}$

Factor $x$ out of $x \cdot 2 + x (- (y + x))$ .

$\frac{x (2 - (y + x))}{(y + x) (y - x)}$

Apply the distributive property.

$\frac{x (2 - y - x)}{(y + x) (y - x)}$