Question

Help!!!!!!!!!

Question 9 is Attached please help me and could you explain on how you got your answer?
I am not the greatest on Solving Equations.
Question is attached!
10 pts +5 pts for the best

Answer 1

There are a couple of different ways you could do this.
I'm going to do it with the least number of steps.

4d - 7 = 3d Subtract 4d from both sides.
4d - 4d - 7 = 3d - 4d
-7 = -d Divide both sides by negative one so that the variable will become positive.
-7/-1 = -d/-1
7 = d