7(1/10)+1(3/10)=8(4/10)=8,4
3(2/7)+3/7=3(5/7)
5(4/9)+3(2/9)=8(6/9)=8(2/3)
7/11+11(2/11)=11(9/11)
25/7+31/7=56/7=8
31/29+11/29=42/29=1(20/29)
79/13+97/13=176/13=13(7/13)
13/9+17/9=30/9=3(3/9)=3(1/3)
21/31+32/31=53/31=1(22/31)
65/53+95/53=160/53=3(1/53)
21/10-3/10=18/10=1,8
45/22-3/22=42/22=1(20/22)
73/25-13/25=60/25=2(10/25)=2,4