\"\"\"\"

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The expression is \"\" .

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Apply cross product:if\"\"then \"\".

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\"\"

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\"\"                              (Distributive property: \"\")

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

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\"\"

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\"\"               (Subtract 7x from each side)

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\"\"               (Commutative property: \"\") 

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\"\"                          (Additive inverse property: \"\")

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\"\"                                (Additive identity property: \"\")    

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\"\"                                        (Subtract: \"\")

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\"\"                              (Multiply each side by negative one)

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

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\"\"

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 The value of  expression is \"\".