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Given that $f(x)$ is an even function, $\displaystyle\int _{ 2 }^{ 7 }{ f( x ) dx=12 } $, and $\displaystyle\int _{ 5 }^{ 7 }{ f( x ) dx=-4 } $, find $\displaystyle\int _{ -5 }^{ -2 }{ f( x ) dx } $.

$32$

$16$

$8$

$-8$