False, 14/21 in simplest form is 3/7., True, 3/9 in simplest form is 1/3., False, 4/8 in simplest form is 2/3., True, 6/10 in simplest form is 3/5., True, 8/12 in simplest form is 2/3., False, 10/15 in simplest form is 5/10., True, 12/18 in simplest form is 2/3., True, 5/10 in simplest form is 1/2.

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