To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $6n+1$ and $5$ is $5\left(6n+1\right)$. Multiply $\frac{n+16}{6n+1}$ times $\frac{5}{5}$. Multiply $\frac{4}{5}$ times $\frac{6n+1}{6n+1}$.
Since $\frac{5\left(n+16\right)}{5\left(6n+1\right)}$ and $\frac{4\left(6n+1\right)}{5\left(6n+1\right)}$ 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 $6n+1$ and $5$ is $5\left(6n+1\right)$. Multiply $\frac{n+16}{6n+1}$ times $\frac{5}{5}$. Multiply $\frac{4}{5}$ times $\frac{6n+1}{6n+1}$.
Since $\frac{5\left(n+16\right)}{5\left(6n+1\right)}$ and $\frac{4\left(6n+1\right)}{5\left(6n+1\right)}$ have the same denominator, subtract them by subtracting their numerators.
