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[9^-2 a^-6 b^10 ] / [ 12^-2 a^2 b ^14]
(9^-2 / 12^-2 ] . a^(-6-2) . b^(10-14]
12²/9² . a^-8 . b^-4
12 x 12 / 3 x 3 x3² . a^-8 . b^-4
4 x 4 / 3² . a^-8 . b^-4
16/9 . a^-8 . b^-4
B