$\lim_{x\to3}\left(-4\right)x$
$w^2-7w-18$
$503^2$
$\int\frac{1}{z^2\sqrt{1+2z}}dz$
$\frac{x+6}{2}<\frac{12-x}{2}$
$\frac{csca}{cosa}$
$\left(-7\right)-\left(-8\right)$
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