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-5 < 2x + 3 < 5
-5 - 3 < 2x + 3 - 3 < 5 - 3
-8 < 2x < 2
-8/2 < 2/2x < 2/2
-4 < x < 1
HP = { x | -4 < x < 1, x ∈ R}