$8x+2$
$\frac{x^2+2x}{3x^2-1}$
$\tan\left(-\frac{9}{4}\pi\right)$
$1+3d^2-3d-d^3$
$\frac{8}{5}xyz+\frac{1}{4}ka-\frac{2}{3}xyz-\frac{1}{8}ka-\frac{1}{3}xyz$
$\frac{t}{1-t^5}$
$3x^2-4x+8$
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