How do i solve 0=-2/3x^(-5/3)+8/3x^(-2/3)?

Which best describes the strength of the correlation, and what is true about the causation between the variables? it is a weak negative correlation, and it is not likely causal. it is a weak negative correlation, and it is likely causal. it is a strong negative correlation, and it is not likely causal. it is a strong negative correlation, and it is likely causal.

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Joanie watched 1 out of three of a movie in the morning