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If 3x - 3x-1 = 18, then the value of xx is :

Answer: C. 27

3x - 3x-1 = 18 ↔ 3x - 3x/3 = 18 ↔ a - a/3 = 18,
where a = 3x ↔ 2a = 54 ↔ a = 27 ↔ 3x = 33 ↔ x = 3. 

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