## Simplifying the Expression: (x+15) + (x+5) + (x+15) + (x+5)

This expression involves combining like terms to simplify it. Let's break it down step-by-step:

### 1. Identify Like Terms:

**x terms:**(x) + (x) + (x) + (x)**Constant terms:**(15) + (5) + (15) + (5)

### 2. Combine Like Terms:

**x terms:**4x**Constant terms:**40

### 3. Combine the Results:

The simplified expression is **4x + 40**.

### Summary:

By combining like terms, we simplified the expression from a series of additions to a concise form with only two terms: **4x + 40**. This is the most simplified form of the original expression.