Let's solve the expression step by step:

$1 - 5 + 1 - 5 + 1 - 5$

1. Start by simplifying the expression from left to right:

$1 - 5 = -4$

2. Then:

$-4 + 1 = -3$

3. Continue:

$-3 - 5 = -8$

4. Next:

$-8 + 1 = -7$

5. Finally:

$-7 - 5 = -12$

So, the value of the expression is:

$\boxed{-12}$

Would you like more details or have any questions? Here are some related questions:

1. What is the order of operations in arithmetic?
2. How do you simplify longer arithmetic expressions?
3. What is the difference between subtracting a number and adding a negative number?
4. How does the associative property affect addition and subtraction?
5. Can you solve similar expressions with parentheses?

Tip: Always follow the order of operations (PEMDAS/BODMAS) to avoid mistakes in more complex expressions.