$x\left(x+1\right)\left(2x+1\right)$
$\int2e^{x^2}dx$
$x\left(x-1\right)>x^2+2x$
$a+b-c-b-c+2b-a$
$-3b+9b+4$
$\left(3ab\right)\left(4a-5ab^4+2abc^3\right)$
$\lim_{x\to3}\left(\frac{x^2+x+2}{x^2-2x-3}\right)$
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