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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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\"\"                                 (The product two same signs is positive)

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\"\"

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If a is negative then \"\"

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Therefore \"\"

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

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\"\"                                  (The product two same signs is positive)

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\"\"

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\"\" and \"\"

\