To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $8$ and $4$ is $8$. Multiply $\frac{1-x}{4}$ times $\frac{2}{2}$.
$$\frac{x}{8}-\frac{2\left(1-x\right)}{8}$$
Since $\frac{x}{8}$ and $\frac{2\left(1-x\right)}{8}$ 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 $8$ and $4$ is $8$. Multiply $\frac{1-x}{4}$ times $\frac{2}{2}$.
$$\frac{x}{8}-\frac{2\left(1-x\right)}{8}$$
Since $\frac{x}{8}$ and $\frac{2\left(1-x\right)}{8}$ have the same denominator, subtract them by subtracting their numerators.
