To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $a-2$ and $2-a$ is $a-2$. Multiply $\frac{4-4a}{2-a}$ times $\frac{-1}{-1}$.
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $a-2$ and $2-a$ is $a-2$. Multiply $\frac{4-4a}{2-a}$ times $\frac{-1}{-1}$.
