$n+1=2n-6$
$2334\cdot1266$
$\lim_{x\to\infty}\left(\frac{x-1}{x-4}\right)^x$
$\left(-20a-15\right)$
$xy^2-x=3$
$\frac{x}{2}\cdot6+\frac{x}{6}\cdot6$
$\frac{x^3+x}{x^2-x}$
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