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3/10+2/5= 3/10+4/10=7/10
4/7-1/14= 8/14-1/14=7/14=1/2
7/12+3/4= 7/12+ 9/12= 16/12= 1 i 4/12= 1 i 1/3
2/5+7/15= 6/15+ 7/15= 13/15
3/8+3/4= 3/8+ 6/8= 9/8= 1 i 1/8
2/3-5/9= 6/9-5/9= 1/9
2/5-7/20= 8/20-7/20=1/20
8/5-3/20= 32/20- 3/20= 29/20= 1 i9/20