$7+4-2+5+1-1-2+3$
$2b^{-4}\:a^{-1}b^3$
$\lim_{x\to\infty}\frac{2x-3x^2}{2-x}$
$\int\arctan2y\:dy$
$\sqrt{2^4}$
$\lim_{x\to3}\left(\frac{x^4-18x^2+81}{\left(x-3\right)^2}\right)$
$\left(5x+2\right)\left(5x-10\right)$
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