d) Simplify: 49+64÷8×3-10

Since the denominators are the same, subtract the numerators.

$$\frac{4}{7} - \frac{1}{7} = \frac{4-1}{7} = \frac{3}{7}$$

$$3 + \frac{3}{7} = 3\frac{3}{7}$$

The result is $\boxed{3\frac{3}{7}}$.

: Simplify: $49 + 64 \div 8 \times 3 - 10$

$$49 + (64 \div 8) \times 3 - 10$$ $$49 + 8 \times 3 - 10$$

$$49 + (8 \times 3) - 10$$ $$49 + 24 - 10$$

$$(49 + 24) - 10$$ $$73 - 10$$

$$63$$

The simplified value is $\boxed{63}$.