Question 989682
Addition Property of Equality and Additive Inverse Property.


.(supply the step)
.(supply the step)
k=7




That can be done in one step or two steps.
That was the response.  Use the properties.  



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My earlier "answer" of 19 was wrong.  k=7 is the true answer.  I did the steps in my head, and did not catch my mistake while handling these steps.