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= -4+1 < 2x-1+1 < 3+1
= -3 < 2x < 4
= -3/2 < 2x/2 < 4/2
= -3/2 < x < 2
= -4+1 < 2×-1+1 < 3+1
= -3 < 2× < 4
= -3/2 < 2×/2 < 4/2
= -3/2 < × < 2
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