Your answer would be x = 9.
We can get this by first expanding the bracket 6(x - 3) and then solving:
6(x - 3) = 3x + 9
6x - 18 = 3x + 9
- 3x
3x - 18 = 9
+ 18
3x = 27
÷ 3
x = 9
I hope this helps!
