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The equation with no solution is:
**3x + 4 = 3x + 3**
This is because when you simplify it, you get:
3x + 4 - 3x = 3
4 = 3
This statement is false, indicating that there is no value of x that can satisfy the equation.
The other two equations have solutions:
- **3x + 4 = 3x + 4** is true for all x (an identity), and
- **3x + 4 = 4x + 3** can be solved for a specific value of x.