a) Solve 3x +1 < 5x + 3 < x + 23
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3x + 1 < 5x + 3 < x + 23
⇒ 3x + 1 - 3 < 5x < x + 23 - 3
⇒ 3x + (-2) < 5x < x + 20
⇒ 3x - 2 < 5x < x + 20
⇒ (3x - 2)/5 < x < (x + 20)/5
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