1. The problem is to add the numbers 1 and 5. 2. The formula for addition is simply $a + b = c$, where $a$ and $b$ are the numbers to add, and $c$ is the sum. 3. Applying the formula: $1 + 5 = 6$. 4. Therefore, the sum of 1 and 5 is 6. 1. The next problem is to subtract the fractions $\frac{2}{7}$ from $\frac{6}{7}$. 2. The formula for subtracting fractions with the same denominator is $\frac{a}{d} - \frac{b}{d} = \frac{a-b}{d}$. 3. Applying the formula: $\frac{6}{7} - \frac{2}{7} = \frac{6-2}{7} = \frac{4}{7}$. 4. Therefore, the result of the subtraction is $\frac{4}{7}$. Final answers: - $1 + 5 = 6$ - $\frac{6}{7} - \frac{2}{7} = \frac{4}{7}$