Answer
Success!
d=2

↓Steps Explained:↓

Solve for d

3d = d + 4

Group variables

Group our variables 3d and d
subtract d from both sides

3d - d = d + 4 - d

Cancel d on the right side:

2d = 4

Divide each side by 3

3d
3
=
  
4
3

Divide each side of the equation by 2

2d
2
=
  
4
2

d = 2

Final Answer

d=2
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