$\int5xe^{-\frac{1}{7}x}dx$
$10x+9=4x-9$
$\lim_{x\to1}\left(\frac{x^3-3x+2}{x^3-4x^2+5x-2}\right)$
$1x^2-24x+1c$
$\frac{2}{3x^4+3}$
$\left(3y+1\right)\left(2y+5\right)$
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