\"\"

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The expression is \"\".

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\"\"                       (Replace c with 2.8 and a with - 5)

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

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

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\"\"                                        (Add: 5.6 + 5 = 10.6)

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The absolute value of 10.6 is 10.6\"\"

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The value of the expression is \"\".