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The functions $s(x)$ and $t(x)$ are differentiable. The function $u(x)$ is defined as: $u(x)= \frac{s(x)}{t(x)}$ If $s(6)= 7$, $s'(6)= 5$, $t(6)= 9$, and $t'(6)= 2$, what is $u'(6)$? Simplify any fractions. $u'(6)=$