Answer:
 making d subject of the formula we get: 

Explanation:
We are given the expression: 
 and we need to make d subject of the formula
So, basically we need to find the value of d
We will be solving the expression: 
 and finding value of d
Given:

Subtracting 2 on both sides

Multiply both sides by 3

So, making d subject of the formula we get: 
