$\:a^6+18^4+81$
$rs\left(rs+3r+2\right)$
$-2\left(x+h\right)^3$
$\int\frac{x+3}{x^3}dx$
$\left(\frac{2}{3}j^2+3t\right)^2$
$x-y+\frac{z}{3}=4$
$\lim_{x\to0}\left(\frac{30x}{x+2}\right)$
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