5) 7 - 3

1. Convert mixed numbers to improper fractions: $$7 = \frac{63}{9}$$, $$3\frac{4}{9} = \frac{31}{9}$$.
2. Subtract the fractions: $$\frac{63}{9} - \frac{31}{9} = \frac{32}{9} = 3\frac{5}{9}$$.