712 - 512 = 200
7(12) - 5(12) = 24
7x - 5x = 2x, or 2 twelve
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Twelve minus seven is five
12 and 5/6ths converts to 12 and 10/12ths. So 12 and 10/12ths - 7 and 5/12ths = 5 and 5/12ths
-8
3/5
(7+5) - (8-3) = 7proof:-(12) - (5) = 7