$\frac{5}{3}x+\frac{4}{9}x$
$-8+3-9+4+1-7-13$
$79\le2-r$
$25a^2+49b^4-24b^4$
$0^{20}$
$\lim_{x\to10}\left(\frac{sin6x}{7x}\right)$
$\int\frac{x^3}{x^2-64}dx$
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