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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 adding the values within the parenthesis.

                         (Substitute 9 for c, and 5 for a)

                                 (Add 9 and 6: )

Next operation is multiplication.

                                       (Multiply: )

The value of the expression is 75.