21 and 35 are both divisible by 7
21/35 = 3/5
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No, 6 & 35 have no common factor
35/68 is already simplified
15/35 = 3/7
To simplify 28 / 35, you divide by the GCF of 28 and 35. The GCF is 7, so 28 / 35 / 7 = 4 / 5.
35/36 is already in its simplest form