$2x-3^2$
$8-3\left|-21\right|$
$3\sqrt{x-2}+2x=6$
$\frac{2}{5}xy^2.\:\frac{7}{10}x^3y$
$\lim_{t\to3}\left(\frac{t^{2}+4t-21}{t-3}\right)$
$\int\frac{1}{\left(x-3\right)^2+5}dx$
$x^4+4x^2+10$
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