$16y+8y+1$
$-42\:x\:-6$
$9^{-3}\cdot9^4$
$\left(u+10\right)\left(u-10\right)$
$5\left(\frac{4x^4+1}{x^4-1}\right)$
$-16+\:x=\:-15$
$\lim_{t\to0}\left(\frac{\sqrt{1+8t}-\sqrt{1-4t}}{t}\right)$
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