$\left(3x^7+2\right)\cdot\left(5x^2+2x^3-2\right)$
$5x+8<8x-3$
$-a^2-6a-9$
$\frac{4\left(s^{4}\right)^{4}}{20s^{8}}$
$5+x=20$
$\frac{\tan a}{\cot a}$
$\left(d^{-10}\right)^{-1}$
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