To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $4-x$ and $x\left(x-4\right)$ is $x\left(x-4\right)$. Multiply $\frac{x}{4-x}$ times $\frac{-x}{-x}$.
Since $\frac{x\left(-1\right)x}{x\left(x-4\right)}$ and $\frac{2x-24}{x\left(x-4\right)}$ have the same denominator, subtract them by subtracting their numerators.
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $4-x$ and $x\left(x-4\right)$ is $x\left(x-4\right)$. Multiply $\frac{x}{4-x}$ times $\frac{-x}{-x}$.
Since $\frac{x\left(-1\right)x}{x\left(x-4\right)}$ and $\frac{2x-24}{x\left(x-4\right)}$ have the same denominator, subtract them by subtracting their numerators.
