\"\"\"\"

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The equation is \"\"

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According to subtraction property of equality: If a = b, then a\"\"c = b\"\"c.

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\"\"                  (Subtract 7k from each side).

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\"\"                  (Commutative property: a + b = b + a)

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

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

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\"\"

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According to subtraction property of equality: If a = b, then a\"\"c = b\"\"c.

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\"\"                           (Subtract 9 from each side)

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

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

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\"\"                                               (Additive identity property: a + 0 = a) \"\"

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Verify the solution:

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To check the solution, substitute \"\" in original equation.

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\"\"\"\"

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

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

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Compare the values, the equation is true.

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\"\"

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The value of \"\".