This is simple manipulation of fractions.

To add these two fractions with different denominators you have to find the smallest common multiple of 3 and 5, which is 15. So:

Hence:

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- July 9th 2013, 08:48 AM #16

- July 9th 2013, 08:54 AM #17

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- July 9th 2013, 10:57 PM #18

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- July 9th 2013, 10:58 PM #19

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