$\left(6a^2-8a+12\right)\left(5a^2-6a+9\right)$
$8a-6ab+5b-2a+13b-ab$
$6m^3n^2,\:9m^2n^3,\:18m^4n^5$
$-23+254$
$\left(4t^3+5u^2\right)^2$
$x^2+29x-44=0$
$\frac{2}{5}m-\frac{4}{5}-\frac{3}{5}m\:$
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