Curve $$\(\mathbf{C}\)$$ has equation $$\(y=p x^{3}-m x\)$$ where $$\(p\)$$ and $$\(m\)$$ are positive integers. Find the range of values of $$\(x\)$$, in terms of $$\(p\)$$ and $$\(m\)$$, for which the gradient of $$\(\mathbf{C}\)$$ is negative.

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