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7/10-4/15=21/30-8/30=13/30
3/14-1/5=15/70-14/70=1/70
2 3/5-7/10=2 6/10-7/10=26/10-7/10=19/10= 1 9/10
2 3/8-1 5/6=2 9/24 - 1 20/24=1 33/24 - 1 20/24= 13/24
3 1/6- 2 3/4=3 2/12 - 2 9/12= 2 14/12-2 9/12=5/12
b)