-2 < x/3 + 1 < 5
Subtract 1 from each side:
-2 - 1 < x/3 + 1 - 1 < 5 - 1
-3 < x/3 < 4
Multiply each side by 3:
-3 • 3 < x/3 • 3 < 4 • 3
-9 < x < 12
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