$x^2-2x+3+\frac{-4x}{x^2+2x+1}$
$18=13x+5$
$\frac{x^3-3x+2}{x-1}$
$10-9x^2+4x=-6x^2$
$+12xy^3+20xy^3$
$\frac{-3}{-3}$
$\lim_{x\to0}\left(\frac{2^x}{e^x}\right)$
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