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"-X-8-X-4" cannot be solved. This is because it is an expression, and expressions can only be reduced into another expression, not solved. In this example, it would reduce to "-2X-12". However, if you substitute -4 for X, you get -4. If the problem read "-X-8-X-4=-4", -4 would be an appropriate solution for X.

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Q: Is -4 a solution of -x - 8 -x - 4?
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