$\lim_{x\to\infty}\left(\frac{x^2-1}{x^2+x-2}\right)$
$\int\frac{x-2}{x^3-3x^2}dx$
$\frac{32^5-n}{2x-1}$
$-2\cdot4+6-8$
$-6+y=12$
$x-9+72$
$\int2^{2x+3}dx$
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