$-5a^2+3a\left(a-1\right)$
$25x\left(14x\left(-2\right)\right)$
$\log_{20}\left(1\right)$
$\left(x\right)\left(3x^2\right)$
$\left(a+c\right)^5$
$9m\:+12mn+4m^2$
$\sqrt{-45}$
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