To find the missing number represented by the question mark (?), we need to identify a repeating pattern or equation that applies to each row. Let’s analyze each row systematically to identify the rule:

Row Analysis:

1. First row: $2, -3, 9, 5$
2. Second row: $8, ?, 3, 7$
3. Third row: $-4, 2, 4, -6$
4. Fourth row: $5, 2, 8, 1$

After examining each row, a common pattern appears:

Pattern Analysis:

The equation that repeats across all rows appears to be: $\text{First number} + \text{Second number} \times \text{Third number} = \text{Fourth number}$

Let's check this rule for each row:

1. First row:
   $2 + (-3) \times 9 = 2 - 27 = -25$
   This row does not directly fit, which suggests the equation involves more steps.

2. Second row (with ? as the unknown):
   $8 + ? \times 3 = 7$.
   Solving for ?:
   $8 + 3x = 7$.
   $3x = -1$.
   $x = -\frac{1}{3}$.

This suggests that an unusual transformation may be at work.

Would you like more detail on this pattern exploration or tips on finding an unknown in sequences?