$64x^2-144x+48$
$\left|1927\right|$
$|5|-8$
$\left(y+\frac{1}{50}\right)\left(y-\frac{1}{50}\right)$
$\frac{12x}{2x}$
$-n^2\cdot5n$
$-a^2-6a-9$
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