so if you just simplify a bit, and combine with the same variable, it becomes;
(-8x-y)k. however, if you do a negative times a negative it becomes positive, therefore, you can write it (8xy)k. but it is not the simplest form. if you do 8 times y, you write the number first, then the variable.
so the simplest and the best form of this would be 8yk
(meaning 8 times y times k)
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different way of thinking this question
-8 times k times -y times k
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