6-8+9-4+6-1

Let's simplify the expression step by step:

1. Start with 6: \( 6 \)

2. Subtract 8: \( 6 - 8 = -2 \)

3. Add 9: \( -2 + 9 = 7 \)

4. Subtract 4: \( 7 - 4 = 3 \)

5. Add 6: \( 3 + 6 = 9 \)

6. Subtract 1: \( 9 - 1 = 8 \)

So, the final result of the expression \( 6 - 8 + 9 - 4 + 6 - 1 \) is \( 8 \).