Verified answer

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

-7 1/6 + (-2 5/6) = -(7 1/6 + 2 5/6) = -(9 6/6) = -10

-4 3/14 + (-1 2/7) = -(4 3/14 + 1 4/14) = -(5 7/14) = -5 целых 1/2