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The verbal translation for the difference of m and 7 increased by 15

If a || b and e || f , what if the value of y ?

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.