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If the replacement set = {-6, -3, 0, 3, 6, 9}; find the truth set of the following: 

3x + 7 < 1

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Best answer

3x + 7 ≤ 1

⇒ 3x + 7 – 7 ≤ 1 – 7 (Subtracting 7)

⇒ 3x ≤ – 6 

⇒ x ≤ – 2 

Required Answer = {-6, -3}

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