6/10 - 1/5 is the same as 6/10 - 2/10 = 4/10 or 2/5 in its lowest terms
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4/5 - 1/10...8/10 - 1/10 = 7/10
1/2 = 5/10 so then 5/10 - 3/10 = 2/10 = 1/5
2/5 − 1/10 = 15/50 which reduces to 3/10
1/10 - 1/2 = 1/10 - 5/10 = -4/10 = -2/5
1/10