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The true statements are:
x + 20 ≥ 50
x ≥ 30
O x + 20 ≥ 50
O x + 20 ≤ = 50
O x ≥ 30
x ≤ = 30
x ≥ = 70
x + 20 ≥ 50
x ≥ 30