\"\"

\

The expression is \"\"

\

\"\"     (Replace x and z with 9, and 12)

\

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 within the parentheses.

\

\"\"        (Multiply: \"\")

\

Next operation is subtraction.

\

\"\"                    (Subtract: \"\")\"\"

\

Next operation is multiplication.

\

\"\"                        (Multiply: \"\")

\

Next operation is addition

\

\"\"                                 (Add: \"\")

\

Next operation is subtraction.

\

\"\"                                       (Subtract: \"\" )                                            \"\"

\

The value of the expression is 48.

\