Answer:
-1
Explanation:
Subtract 6v from both sides 
- 5v - 4 - 6v = 6v - 3 - 6v
- - 1v - 4 = - 3 
Add 4 on both sides
- -1v - 4 + 4 = -3 + 4 
- -1v = 1 
Divide both sides by 1 
Verification : 
Let LHS = 5v - 4
RHS = 6v - 3 
Solving for LHS, substitute the value of v,
- LHS = 5v - 4
- LHS = 5(-1) - 4 
- LHS = -5 - 4 
- LHS = -9 
Solving for RHS,
- RHS = 6v - 3 
- RHS = 6(-1) - 3 
- RHS = -6 - 3 
- RHS = -9
LHS = RHS
Therefore the value of v is -1