$\"\"$

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The expression is $\"\"$

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$\"\"$ (Substitute $\"\"$ ) $\"\"$

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According definition of absolute value:

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If a is a negative number, then $\"\"$ .

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$\"\"$

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$\"\"$ (Product of two same signs is positive)

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

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$\"\"$

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The value of the expression is $\"\"$ .