$\lim_{x\to\infty}\left(\frac{3x-1}{5^{2x+1}}\right)$
$x^2-4b^2$
$-2u^2+u$
$mn-7n-n-n$
$\int\left(x\cdot e^{\frac{x}{2}}\right)$
$\frac{6x^3-2x^2-1}{x^2+x+1}$
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