$-21\cdot3-4$
$111\cdot5$
$\int\ln\left(\frac{3+x}{3-x}\right)dx$
$\frac{d}{dx}+2y=x^2+2x$
$\left(3a+5\right)\left(3a-8\right)$
$4t^2-3t+9=0$
$14x^2+3x-5$
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