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Divisibilitymedium
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If a≡3(mod9)a \equiv 3 \pmod{9}a≡3(mod9) and b≡2(mod9)b \equiv 2 \pmod{9}b≡2(mod9), what is (2a−3b) mod 9(2a - 3b) \bmod 9(2a−3b)mod9?