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4/5 - 2/10 = 4/5 - 1/5 = 3/5
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10/4 - z - 8/16 = 21/2 - z - 1/2 = 2 - z
4/10 or 2/5
7/10 - 4/10 = 3/10
9/10 - 1/2 = 9/10 - 5/10 = 4/10 = 2/5
Ans: 2 10 minus 4 times 2 = 10 - (4*2) = 10-8 = 2