The given congruence equation is:

\[
x \equiv 7 \ (\text{mod} \ 4)
\]

This means that \( x \) leaves a remainder of 7 when divided by 4. However, since 7 is greater than 4, we reduce it modulo 4. Specifically, we find the remainder when 7 is divided by 4:

\[
7 \div 4 = 1 \ \text{remainder} \ 3
\]

So, \( 7 \equiv 3 \ (\text{mod} \ 4) \).

Therefore, the congruence can be rewritten as:

\[
x \equiv 3 \ (\text{mod} \ 4)
\]

This implies that the solution to the equation \( x \equiv 7 \ (\text{mod} \ 4) \) is equivalent to \( x \equiv 3 \ (\text{mod} \ 4) \), which means that \( x \) can take any value of the form:

\[
x = 4k + 3
\]

for any integer \( k \).

### Would you like more details or have any questions?

Here are 5 related questions to deepen understanding:

1. What is the general method for solving modular equations?
2. How do you handle negative numbers in modular arithmetic?
3. What is the Chinese Remainder Theorem, and how does it apply to solving systems of congruences?
4. Can we solve \( x \equiv 7 \ (\text{mod} \ 4) \) if the modulus is not prime?
5. What are applications of modular arithmetic in cryptography?

**Tip:** Always reduce large numbers modulo the divisor to simplify congruences.

Explore the solution to the congruence equation x ≡ 7 (mod 4). This detailed explanation covers key concepts of modular arithmetic, including how to reduce large numbers modulo smaller values. Suitable for students in Grades 9-12.

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