Question

Solution to 4d+9=21?

Answer 1

Answer: 3 = d

Explanation:

4d + 9 = 21

- 9 - 9

4d = 12

— —

4 4

d = 3

Answer 2

d = 3

Explanation:

4d+9=21

4d = 12

d = 3

Let's check

4(3) + 9 = 21

12 + 9 = 21

21 = 21

So, d = 3 is the correct answer.