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D: a > 0 ∧ a ≠ 1
1) a > 0 ⇔ 3(x-2) > 0
3x - 6 > 0
3x > 6
x > 2
2) a ≠ 1 ⇔ 3(x-2) ≠ 1
3x - 6 ≠ 1
3x ≠ 7
x ≠
odp. x ∈ (2,