To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $5$ and $4$ is $20$. Multiply $\frac{2x-1}{5}$ times $\frac{4}{4}$. Multiply $\frac{x}{4}$ times $\frac{5}{5}$.
$$\frac{4\left(2x-1\right)}{20}-\frac{5x}{20}$$
Since $\frac{4\left(2x-1\right)}{20}$ and $\frac{5x}{20}$ have the same denominator, subtract them by subtracting their numerators.
$$\frac{4\left(2x-1\right)-5x}{20}$$
Do the multiplications in $4\left(2x-1\right)-5x$.
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $5$ and $4$ is $20$. Multiply $\frac{2x-1}{5}$ times $\frac{4}{4}$. Multiply $\frac{x}{4}$ times $\frac{5}{5}$.
$$\frac{4\left(2x-1\right)}{20}-\frac{5x}{20}$$
Since $\frac{4\left(2x-1\right)}{20}$ and $\frac{5x}{20}$ have the same denominator, subtract them by subtracting their numerators.
$$\frac{4\left(2x-1\right)-5x}{20}$$
Do the multiplications in $4\left(2x-1\right)-5x$.
