$\left(4-6-9\right)+\left(4+5-2\right)$
$5-\frac{x}{2}=3x-16$
$n^2+n+20=0$
$98+\left(-1\right)$
$\frac{3x}{x+5}<=3$
$\left(14x\right)^3$
$\frac{secxcosx}{sinx}=cscx$
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