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Janusz
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![12.Verify the following: [2\/3 + (- 2\/5)] + 7\/10 = 2\/3 + [(- 2\/5) + 7\/10]](http://i.ytimg.com/vi/N-FZVUQCJo0/mqdefault.jpg "12.Verify the following: [2\/3 + (- 2\/5)] + 7\/10 = 2\/3 + [(- 2\/5) + 7\/10]")
