1) 7/8-3/4=7/8-6/8=1/8
2). 7/10+3/5-4/5=7/10+6/10-8/10=13/10-8/10=5/10=1/2
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1) 7/8-3/4=7/8-6/8=1/8
2). 7/10+3/5-4/5=7/10+6/10-8/10=13/10-8/10=5/10=1/2