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For what value of (y) is 3^3/3^y =1/9

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

Answer pls man im trying to get out of summer school