$\left(6x-5\right)\left(6x-20\right)$
$\:\frac{9x^2-25y^2}{3x+5y}\:$
$\:\:\:\:2+\:4\:\left(3\:+\:5m\right)\:+\:2m$
$\frac{1}{3}-\left\{\frac{4}{9}x\frac{3}{2}-\frac{19}{6}+\frac{1}{2}\right\}^3+\frac{2}{3}$
$3a^2-10a+8$
$\frac{u+u^2}{1-u}$
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