The expression is

                 (Substitute:)

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

1.     Evaluate the expressions inside Brackets/Parenthesis (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 pf operations is turned

into phrase

“Please Excuse My Dear Aunty Sally"

First operation is parenthesis.

                      (Add: )

Next operation is Evaluate powers.

                      (Evaluate powers: )

The value of the expression is 1728.