To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $6$ and $5$ is $30$. Multiply $\frac{x}{6}$ times $\frac{5}{5}$. Multiply $\frac{2-x}{5}$ times $\frac{6}{6}$.
$$\frac{5x}{30}-\frac{6\left(2-x\right)}{30}$$
Since $\frac{5x}{30}$ and $\frac{6\left(2-x\right)}{30}$ 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 $6$ and $5$ is $30$. Multiply $\frac{x}{6}$ times $\frac{5}{5}$. Multiply $\frac{2-x}{5}$ times $\frac{6}{6}$.
$$\frac{5x}{30}-\frac{6\left(2-x\right)}{30}$$
Since $\frac{5x}{30}$ and $\frac{6\left(2-x\right)}{30}$ have the same denominator, subtract them by subtracting their numerators.