$\"\"$

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The expression is $\"\"$

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$\"\"$ (Replace y, z and x with 4, 2 and -3)

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

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

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

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Rewrite the expression

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$\"\"$

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

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Value of the expression is 21.

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