To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $x-1$ and $1-x$ is $x-1$. Multiply $\frac{2x-1}{1-x}$ times $\frac{-1}{-1}$.
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $x-1$ and $1-x$ is $x-1$. Multiply $\frac{2x-1}{1-x}$ times $\frac{-1}{-1}$.
