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6ab
Yes, it is a 12a
Avatar has a 12A certification in the UK.
In algebra, the expression (12a - a - a - a) can be simplified by combining like terms. Since there are three (a) terms being subtracted from (12a), you can rewrite it as (12a - 3a). This simplifies to (9a). Thus, the final result is (9a).
12a