1. The problem is to express the fraction \frac{3}{7} as a decimal or simplified form. 2. Since \frac{3}{7} is already in simplest form (3 and 7 have no common factors other than 1), we can convert it to a decimal by dividing 3 by 7. 3. Perform the division: 3 \div 7 = 0.428571428571... which is a repeating decimal with the sequence 428571 repeating. 4. Therefore, \frac{3}{7} = 0.\overline{428571} where the bar indicates the repeating sequence. 5. The fraction is already simplified, and its decimal form is a repeating decimal as shown.