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Mathematics 8 Online
OpenStudy (anonymous):

11 < 2x + 3 < 21

jimthompson5910 (jim_thompson5910):

11 < 2x + 3 < 21 11-3 < 2x < 21-3 8 < 2x < 18 8/2 < x < 18/2 4 < x < 9

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