The problem asks us to evaluate the expression $-25 + 21 + (-4) + 25$.

1. Problem Description

The problem asks us to evaluate the expression $-25 + 21 + (-4) + 25$.

2. Solution Steps

First, we can rewrite the expression to remove the parentheses:

$-25 + 21 - 4 + 25$.

Now, we can add the numbers from left to right:

$-25 + 21 = -4$

So the expression becomes:

$-4 - 4 + 25$

$-4 - 4 = -8$

So the expression becomes:

$-8 + 25$

$-8 + 25 = 17$

3. Final Answer

$17$