12 and 5/6ths converts to 12 and 10/12ths. So 12 and 10/12ths - 7 and 5/12ths = 5 and 5/12ths
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Eleven of anything minus seven of the same thing leaves four of them.
Twelve minus seven is five
Seven twelves = 7*12 = 84
a quarter :)
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