The equation given is:

$\frac{d}{4} + 6 = 15$

Steps to solve:

1. Subtract 6 from both sides to isolate the term with $d$: $\frac{d}{4} + 6 - 6 = 15 - 6$ Simplifying: $\frac{d}{4} = 9$

2. Multiply both sides by 4 to solve for $d$: $d = 9 \times 4$ So, $d = 36$.

Final Answer:

$d = 36$

Would you like more details or further explanation?

Here are 5 related questions to expand your understanding:

1. How would you solve $\frac{d}{3} + 5 = 20$?
2. What happens if there is a negative sign before the fraction, such as $-\frac{d}{4} + 6 = 15$?
3. Can you generalize the solution method for $\frac{d}{x} + a = b$?
4. What would change if the equation had multiplication instead of addition, like $\frac{d}{4} \times 6 = 15$?
5. How would you check your solution by substituting $d = 36$ back into the original equation?

Tip:

When solving equations, always perform the same operation on both sides to keep the equation balanced.