\"\"

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The expression is \"\".

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\"\"               (Substitute x = – 3, y = 8 and z = – 12 in original expression)\"\"

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Additive inverse of  – 3 is  3.

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To subtract – 3, add 3.

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\"\"

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

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Additive inverse of  – 11 is 11.

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To subtract – 11, add 11.

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\"\"

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

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The simplified expression is – 23.

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