How do you solve the equation 2x + 15 = 6x + 9?

To solve the equation 2x + 15 = 6x + 9, we can follow these steps:

Rearrange the equation: Start by moving all terms involving x to one side of the equation and the constant terms to the other side. We can do this by subtracting 2x from both sides:
```
2x + 15 - 2x = 6x + 9 - 2x
```
This simplifies to:
```
15 = 4x + 9
```
Isolate the x term: Next, we want to get x by itself. We can subtract 9 from both sides:
```
15 - 9 = 4x + 9 - 9
```
Which simplifies to:
```
6 = 4x
```
Divide to solve for x: Now divide both sides by 4 to solve for x:
```
x = 6 / 4
```
Simplifying that gives:
```
x = 3 / 2
```
or x = 1.5.

So, the solution to the equation 2x + 15 = 6x + 9 is x = 1.5.