16/21 minus two equals -1 5/21
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10/4 - z - 8/16 = 21/2 - z - 1/2 = 2 - z
Expressed as a proper fraction in its simplest form, 6/7 - 2/21 = 16/21 (that is, sixteen twenty-firsts). Expressed as a decimal, this is equal to 0.761904 recurring (that is, 0.761904761904...)
1 over 21. 5/7 - 2/3 = 15/21 - 14/21 = 1/21
87/21 - 73/21 = 14/21 = 2/3
6/7 - 2/3 = 18/21 - 14/21 = 4/21