To solve the expression $(3 + i) - (7 - i)$, follow these steps:

1. Distribute the negative sign: $(3 + i) - (7 - i) = 3 + i - 7 + i$

2. Combine the real parts: $3 - 7 = -4$

3. Combine the imaginary parts: $i + i = 2i$

So, the simplified result is: $-4 + 2i$

Would you like more details or further explanations?

Here are 5 related questions to explore:

1. What are complex numbers and how are they used in mathematics?
2. How do you multiply complex numbers?
3. What is the complex conjugate of a number?
4. How do you calculate the magnitude (or modulus) of a complex number?
5. How do you add or subtract more than two complex numbers?

Tip: When dealing with complex numbers, always separate real and imaginary parts to simplify operations.