Answer
15
Work Step by Step
-k – m - 8n
= - (0) – (-7) – 8(-1) (k is 0, m is -7, n is -1)
= 7 – (-8) (change subtraction to addition (-7) to (7))
= 7 + 8 (change subtraction to addition (-8) to (8))
= 15
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