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$\"\"$

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The value is $\"\"$ .

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If a is any number, then the opposite of a is –a.

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So $\"\"$

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$\"\"$

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$\"\"$

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If a is positive then $\"\"$

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Therefore $\"\"$

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$\"\"$ (Absolute value $\"\"$ )

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$\"\"$

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$\"\"$ and $\"\"$

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