$\lim_{x\to2}\left(x^2-4\cdot x+1\right)$
$-9\cdot x^2-21\cdot x=0$
$-6+15p$
$6c-\left[-\left(2a+c\right)+\left\{-\left(a+c\right)-2a-\left(a+b\right)\right\}+2c\right]$
$\left(-a^2b^5c\right)\left(2a^2b^6c^3\right)$
$7\times22+2\times35$
$\left(8x+2\right)\left(3x-2\right)$
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