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Mathematics 9 Online
OpenStudy (anonymous):

Prove If |3A-3B|< d and |B-C|< (d/2) then |A-C| < d

OpenStudy (tamtoan):

same as the other problem, just factor the 3 out of 3A - 3B so you have |A - B| < d/3 and repeat the process, remember d/3 < d/2

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