$\frac{\left(-1\right)^{n+1}}{n}$
$5x^2+x+6+x^2-2x+1$
$5xy^3z^2;x=3,y=-2,z=1$
$9m^2-91m+10$
$\lim_{x\to7}\left(x^2+2x+4\right)$
$8a^2-24x+18$
$\frac{8x^2+20x^3}{4x^2}$
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