$-9\left(-5+4\right)$
$-\left(-5\right)-\left(-12\right)$
$\sqrt{19t}-\sqrt{5}$
$\sec\left(x\right)=\frac{-2}{\sqrt{3}}$
$-7-9+5-1$
$\left(2\right)\left(2\right)^5$
$9xy-3z-6xy+4z+2xy$
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