\"\"\"\"

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The expression is \"\".

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According to addition property of equality: if a = b, then a + c = b + c.

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\"\"             (Add 6 to each side)

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

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k = 19                                 (Add: 13 + 6 = 19)\"\"

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Check:

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To check the solution Substitute the value of k = 19 in above expression.

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\"\"

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13 = 13                            (Subtract: \"\")\"\"

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The value of k = 19

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By the number line k = 19\"number