In this case, since there are so few places to look, you may wish simply to hunt around. I'll just think about it for a moment and try something. This should give me a clue where to look. I'll start with x=-9.
(-9)(-8)(-7) = -504 -- Well, that wasn't much of a hunt. I hit it on the first try.
Really, I was just guessing, knowing ONLY that all three values had to be negative.
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