The expression shown in the image appears to be:

$1 - 5 + 1 - 9 + 7 + 1 = \dots$

I can help you calculate this step by step:

$1 - 5 = -4$ $-4 + 1 = -3$ $-3 - 9 = -12$ $-12 + 7 = -5$ $-5 + 1 = -4$

So, the final result of the expression is:

$1 - 5 + 1 - 9 + 7 + 1 = -4$

Would you like further clarification on any part of the calculation?

Here are 5 related questions to consider:

1. What is the significance of the order of operations in expressions like this?
2. How do negative numbers affect addition and subtraction?
3. Can you identify other patterns in the sequence that might help solve it faster?
4. How would this problem change if there were parentheses or other operations involved?
5. How can you extend this sequence if additional terms are given?

Tip: When solving expressions with both addition and subtraction, it can help to group terms to simplify calculations, especially if alternating positive and negative numbers appear frequently.