$\left(2\cdot10-10^3+3\cdot10^2\right)$
$3x^4+x^3+3x^2+x$
$6x^2-36+12x$
$\int\frac{x+3}{-3x^3-x^2+2x}\:dx$
$x^2-x-2=18$
$\left(mn-2\right)\left(mn+5\right)$
$\lim_{x\to0}\left(1+x^2e^x\right)^{\frac{1}{x}}$
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