Let's simplify the expression step by step:

$\frac{x}{3} + \frac{3+1}{5}$

First, simplify the second term:

$\frac{3+1}{5} = \frac{4}{5}$

So the expression becomes:

$\frac{x}{3} + \frac{4}{5}$

This is the simplified form of the given expression. If you want to combine these into a single fraction, you'd need to find a common denominator, but as it stands, this is the simplified result.

Would you like me to combine these fractions or explain anything further?

Related questions:

1. How do you find the least common denominator between two fractions?
2. What would happen if we had to solve for $x$ in this equation?
3. How do you add fractions with different denominators?
4. What is the general approach for solving equations with fractions?
5. How would you handle an expression with variables in both terms?

Tip: When adding fractions, make sure the denominators are the same before you add the numerators!