$\"\"$

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The expression is $\"\"$ .

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$\"\"$ (Replace z, y and x with 2, 4 and $\"\"$ )

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$\"\"$ . (Add: $\"\"$ )

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

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$\"\"$ . (Absolute value of $\"\"$ is 3)

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

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The value of the expression is 9.