$f(x)=(7x-2)(5x-8)(x+5)(x-6)$ has zeros at $x=-5$, $x=\dfrac{2}{7}$, $x=\dfrac{8}{5}$, and $x=6$.
**What is the sign of $f$ on the interval $-5<x< \dfrac{2}{7}\ $**?
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