$\left(4xy+5y^2-12y+x\right)\left(x^2-3y-12\right)-\frac{1}{3}x+7xy-\frac{2}{5}x^3$
$8n+13n^2+19n^2$
$1m^3-1m^3$
$\int\left(\frac{x+10}{x^2+20x+9}\right)dx$
$\frac{dx}{dt}=3t+2x$
$\left(6^3\right)\left(-6^3\right)$
$\frac{3x-1}{7}-\frac{2-4x}{3}\ge\frac{-5x-4}{14}+\frac{7x}{7}$
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