$\left|-50\right|-\left|150\right|$
$\left(\frac{m^{3a+1}}{m^{n-3}}\right)$
$\int\frac{2x+21}{2x^2+9x-6}dx$
$\frac{d}{dx}y^2=\frac{x-1}{1-x}$
$\lim_{x\to\infty}\frac{1}{x^2-4}$
$2a-3a-2a+a$
$-64x^2+64x-12$
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