Assignment:
Find the solutions of
(1) 153x is congruent to 6 (mod 12)
(2) x + 1 is congruent to 3 (mod 7)
(3) 8x is congruent to 6 (mod 422)
(4) 363x is congruent to 345 (mod 624).
Provide complete and step by step solution for the question and show calculations and use formulas.