$x^4+2x^3+x^8$
$\left(81\cdot r^2-49\right)\left(4\cdot s^2-16\right)$
$-k^2+7k+2$
$5\cdot122$
$\left(\frac{7}{5}a^{2}b^{3}c^{4}+\frac{15}{14}b^{4}c\right)$
$x=3\tan\left(y\right)$
$20x-2x^2$
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