+257
+371
+257
+371 a)Which of the residues $0, 1, 2, \ldots, 11$ satisfy the congruence $3x \equiv 0 \pmod{12}?$Give your answer as a list, separated by commas, in order from least to greatest.
b)Which of the residues $0, 1, 2, 3, 4$ satisfy the congruence
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