$x3xy2$
$4x-9+-5x+2$
$\left(10x^3+5x^2-3x-3\right)+\left(2x^3-x^2+3x+8\right)$
$3x-4xy+7xy+5xy-6xy-2xy+9xy+9xy-8x$
$\frac{d}{dx}\left(x-3\right)^2+y^2=1$
$x+1x^2-144$
$\frac{x^6+3x^4+3x^2}{x^2+1}$
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