Find the solutions of each of the following systems of congruences:
(a) 5x + 3y ≡ 1 (mod 7)
3x + 2y ≡ 4 (mod 7).
(b) 7x + 3y ≡ 6 (mod 11)
4x + 2y ≡ 9 (mod 11).
(c) 11x + 5y ≡ 7 (mod 20)
6x + 3y ≡ 8 (mod 20).
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