1<x, [1,+inf), (1,+inf), (-inf, 1), (-inf, 1], x≥3, [3,+inf), (-inf, 3], (-inf, 3), (3, +inf), 3<x≤7, (3,7), [3,7), (3,7], [3,7], -5≥x, (-inf, -5), (-inf, -5], [-5, +inf), (-5, +inf), -3≤x, (-inf, -3], (-inf, -3), (3, +inf), [-3, +inf)

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