Answer
$= -\frac{1}{2}$
Work Step by Step
$= \frac{5-2\times6 + (-3)}{(-2)^{2}+4^{2}}$
$= \frac{5-12 - 3}{4+16}$
$= \frac{-10}{20}$
$= -\frac{1}{2}$
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