4X - 3 = 3x - 9.

To solve the equation, we need to isolate the variable x on one side of the equation. We can do this by using the properties of equality to simplify the equation.

Starting with the equation: 4x - 3 = 3x - 9

We can start by moving all the terms with x to one side of the equation:

4x - 3x = -9 + 3

Simplifying, we have:

x = -6

So the solution to the equation is x = -6.