Question:
Compute $29^{13} - 5^{13}$ modulo 7.

Answer:
Firstly, note that $29 \equiv 1$ modulo 7, so $29^{13} \equiv 1$ modulo 7. Also, $5 \equiv (-2)$, so $1 - 5^{13} \equiv 1 + 2^{13}$ modulo 7. Finally, $2^3 \equiv 1$ modulo 7, so $2^{13} \equiv 2(2^3)^4 \equiv 2 \cdot 1 \equiv 2$. Thus $29^{13} - 5^{13} \equiv 1+2 \equiv \boxed{3}$ modulo 7.