$\left(u-5\right)\left(u+5\right)$
$81x^2-12x+36$
$x4-2x^2-1$
$\frac{x-4}{\sqrt{x}}=0$
$40x^9\:+\:100x^2\:+\:50x^6$
$2x^2z^3y^4\left(3+y\right)+10x^4y^4$
$25x^2-20x+4>0$
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