Given,
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Multiplication by (x + 1)
⇒ 4 ≤ 3(x + 1) ≤ 6
⇒ 4 ≤ 3x + 3 ≤ 6
Subtracting each side 3, we get
⇒ 1 ≤ 3x ≤ 3
Dividing each side by 3,
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