inequalities
6x - 9 <= 12x + 9 < 6x + 81
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Answer:
6x - 9 <= 12x + 9 and 12x + 9 < 6x + 81
-18 <= 6x and 6x < 72
x => -3 and x < 12
combining both inequalities we get,
-3 <= x < 12.
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