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The expression is 

To simplify the expression following order of operations to performed:

1.      Evaluate the expressions inside grouping symbols.

2.      Evaluate Powers.

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

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

According order of operations inside the grouping symbols should be evaluated first.

First operation is evaluating expression inside the brackets.

                        (Add: )

Next operation is division.

                                (Divide; )

Next operation is subtraction.

                                     (Subtract:)

The value of the expression is 2.