Cho A; B:

The image contains mathematical sets and operations. Here's a breakdown of the contents:

1. **Set Definitions**:
- \( A = \{ x \mid |x| < 3 \} \)
- \( B = \{ x \mid 2x + 5 > 0 \} \)

2. **Operations to Perform**:
- Find \( A \cap B \) (intersection)
- Find \( A \setminus B \) (set difference)
- Find \( A \cup B \) (union)
- Find \( C_R A \) and \( A \cap N' \) (where \( C_R \) could imply the complement relative to some context).

3. **Additional Definitions**:
- A new set is defined: \( A = (-\infty, -1) \cup (3, \infty) \)
- \( B = \{ x \in \mathbb{R} \mid 1 - 7x < 0 \} \)

4. **Operations to Perform**:
- Again, find \( A \cap B \), \( A \cup B \), \( A \setminus B \), \( B \setminus A \), and \( C_R B \).

If you need help with a specific calculation or concept related to these sets, just let me know!