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September 18, 2014

September 18, 2014

Posted by **Rob** on Monday, July 1, 2013 at 8:02pm.

- Math 17 -
**Steve**, Tuesday, July 2, 2013 at 12:07amYou change nothing when you multiply by 1. So,

b/a + d/c = b/a * c/c + d/c * a/a = bc/ac + ad/ac = (bc+ad)/ac

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