= (3 1/7 - 1) + 1 4/7
= 3 + 1/7 - 1 + 1 4/7
= 3 + 1/7 - 1 + 1 + 4/7
= 3 - 1 + 1 + 1 + 1/7 + 4/7
= 3 + 1 + 1/7 + 4/7
= 5 + 5/7
= 5 5/7

Therefore, (3 1/7 - 1) + 1 4/7 = 5 5/7.