$\frac{x^7+2x^3-4x+5}{x-2}$
$42x+63x^2-18x-29x^2$
$-6\sin\left(x\right)-3$
$\left(\frac{2}{5}xy+\frac{1}{4}z^2\right)\left(\frac{2}{5}xy-\frac{1}{4}z^2\right)$
$2y''-5y'+2y=0$
$3\left(x-1\right)+2\left(x-2\right)=4\left(x+2\right)$
$4x+7x+2x+2x+10x+5x+x+x$
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