5 5/9+4 1/7+7 6/7+2 1/2=

5 5/9+4 1/7+7 6/7+2 1/2
= ( 5+4+7+2) 5/9 +1/7 +6/7 +1/2
= 18 ( 70+18+108+63)/ 126
= 18  259/126
= 20  7/126
= 20  1 /18

50/9 + 29/7 + 55/7 + 5/2
= 1106/63 + 5/2
= 2527/126
= 20 7/126