-7 ≤ 9 - 8x < 16 - x
-7 ≤ 9 - 8x and 9 - 8x < 16 - x
-7 - 9 ≤ -8x and -8x + x < 16 - 9
-16 ≤ -8x and -7x < 7
∴ x ≤ 2 and -1 < x
-1 < x ≤ 2.