$6x^2+3x-5x^2-7x$
$323+456$
$x^3-7x^3-8x^2y+4x^2y+5$
$\lim_{x\to0}\left(\frac{x^2-5x^3}{x^2}\right)$
$\sqrt[3]{x}\left(8-x\right)$
$x^2+42x+441$
$\frac{2x^2+1}{x-1}$
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