To simplify the expression, we follow the order of operations (PEMDAS/BODMAS).
First, we simplify within parentheses:
15 - 7 = 8.
Next, we perform the division and multiplication from left to right:
4 ÷ 2 ⋅ 2 ⋅ 4 ÷ 8.
4 ÷ 2 = 2:
2⋅2⋅4÷8.
Next, we perform the multiplications:
2⋅2⋅4 = 16:
16÷8.
Finally, we do the division:
16 ÷ 8 = 2.
Therefore, the simplified expression is 2.