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-3≤1+4/x ∧ 1+4/x≤3,
0≤(4x+4)/x ∧(-2x+4)/x≤0,
0≤x(4x+4) ∧ x(-2x+4)≤0,
x∈(-∞,-1>U(0,∞) ∧ x∈(-∞,0)U<2,∞),
x∈(-∞,-1>U<2,∞)