Subtract 1 from all parts of the inequality: − 3 < 3 x < 4 .
Multiply all parts of the inequality by 3: − 9 < x < 12 .
The solution to the inequality is − 9 < x < 12 .
The correct answer is B: $\boxed{-9
The solution to the inequality − 2 < 3 x + 1 < 5 is − 9 < x < 12 , which corresponds to option B. This was determined by solving the two parts of the inequality separately. Hence, the correct answer is B.
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