List all integers x in the range -50 ≤ x ≤ 50 that satisfy x ≡ 7 (mod 17).
(b) Exhibit a set of representatives modulo 17 composed entirely of multiples of 3.
(c) Write a single congruence that is equivalent to the pair of congruences x ≡ 2 (mod 7), x ≡ 3 (mod 10).