1 1/3 * 3/7 + 4/7 * 1 1/3.

1. Convert the mixed number to an improper fraction: 1 1/3 = 4/3.
2. Apply the distributive property: (4/3) * (3/7 + 4/7) = (4/3) * (7/7) = (4/3) * 1 = 4/3.