The expression is 

Order of Operations:

To simplify the expression follow the order of operations: (PEMDAS)

1.      Evaluate the expressions inside the Parenthesis/Brackets (P).

2.      Evaluate Powers/Exponents (E).

3.      Multiply and/or Divide in order from left to right (MD).

4.      Add and/or Subtract in order from left to right (AS). 

A simple technique for remembering the order of operations is turned

into phrase "Please Excuse My Dear Aunty Sally"

Evaluate the expression within the parentheses.

               (Evaluate the power: )

Next operation is subtraction.

                     (Subtract: )

Next operation is division.

                                      (Divide: )

Next operation is multiplication.

                                          (Multiply: )

The value of the expression is 36.