Simplify. Enter a single, simplified rational expression or integer. $$ \frac{1}{5}+\frac{1}{15} $$ $$ \frac{1}{3}-\frac{1}{5} $$

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Simplifying each expression:

1. $$\frac{1}{5} + \frac{1}{15}$$
   $$
   \frac{1}{5} = \frac{3}{15} \quad \text{so} \quad \frac{3}{15} + \frac{1}{15} = \frac{4}{15}
   $$

2. $$\frac{1}{3} - \frac{1}{5}$$
   $$
   \frac{1}{3} = \frac{5}{15} \quad \text{and} \quad \frac{1}{5} = \frac{3}{15} \quad \text{so} \quad \frac{5}{15} - \frac{3}{15} = \frac{2}{15}
   $$

**Final Simplified Expressions:**
$$
\frac{4}{15} \quad \text{and} \quad \frac{2}{15}
$$
$$ \frac{4}{15} \quad \text{and} \quad \frac{2}{15} $$

Simplify. Enter a single, simplified rational expression or integer.

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