Start by getting your given solution into terms of 3x.
Using logic, if 6x is 54, to get 3x you have to divide by 2. So, you also divide your answer by 2.
This leaves you with:
3x = 27
Next, substitute your value of 3x into your equation.
This results in:
29 + 27
Add to find your final answer.
29 + 27 = 56.
So your final answer is 56.