$162-8x^2$
$2st^4-8st^2-90s$
$\left(x+\frac{2}{5}\right)\left(\frac{1}{2}x+\frac{1}{6}\right)$
$3\left(g-4\right)$
$\left(e^x+e^{-x}\right)^2$
$16\sqrt{5}+9\sqrt{5}-\sqrt{5}$
$\frac{x+1}{x-2}=\frac{3}{x^2-x-2}-2$
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