Try this GRE math practice question that tests your ability to manipulate and rearrange algebraic expressions to isolate one variable in terms of another variable.

**Question#71**: If $y = \dfrac{m}{m-n}$ and $x = \dfrac{n}{m+n}$, what is $y$ in terms of $x$?

- $\quad \dfrac{1-x}{1-2x}$
- $\quad \dfrac{1-x}{2x-1}$
- $\quad \dfrac{x}{1-x}$
- $\quad \dfrac{x}{x-1}$
- $\quad \dfrac{1-x}{x}$

**Video explanation**

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