$3x^2\left(5x-6x^3\right)$
$4w\:-\:6\:-\:9w\:+\:3$
$e\arccoth\left(\ln\left(xy\right)\right)+\sec\left(xy\right)$
$5k+2k+k-k$
$8a+6a$
$\frac{4}{5h^2-15h}.\frac{5h^3-20h^2+15h}{5h-4}$
$12\cdot10$
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