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-6 ≤ 2x - 9 ≤ 6
-6 + 9 ≤ 2x - 9 + 9 ≤ 6 + 9
3 ≤ 2x ≤ 15
3/2 ≤ 2/2x ≤ 15/2
3/2 ≤ x ≤ 15/2
HP = { x | 3/2 ≤ x ≤ 15/x, x∈R}