\"\"

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The expression is \"\"

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\"\"                (Replace z, y and x with 12, 4 and 9)

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To simplify the expression following order of operations to performed:

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1.   Evaluate the expressions inside grouping symbols.

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2.   Evaluate Powers.

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

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

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First evaluate within the parentheses.

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

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Next operation is multiplication.

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

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Next operation is subtraction.

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

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The value of the expression is 71.

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