To solve this expression, we need to follow the order of operations, which is parentheses, exponents, multiplication/division (from left to right), and addition/subtraction (from left to right).

First, let's simplify the expression inside the parentheses:
(8^2 - 49) = (64 - 49) = 15

Now, let's simplify the expression inside the brackets:
[(15) * 3 + 135] = (45 + 135) = 180

Finally, let's divide the result by 18:
180 ÷ 18 = 10

Therefore, the value of the expression is 10.