We are given the following expression:

We need to find the value of z when y = 6. Thus:

First, we can solve the parentheses:

Now, we can add 6 on both sides, and subtract 5z on both sides:

Simplify:

Divide by 3 on both sides:

Rounded to 2 decimals, the answer is:
z = 3.33,
Thus, OPTION A is the correct answer.