$\frac{1}{2}\left(4\cdot5\right)-2^3$
$\lim_{x\to0}\left(x+xe^{-x}\right)$
$27x^7\:+\:54x^6\:+\:64x\:+\:128$
$6x^2+17x-2$
$15xy^3\left(9x^5y^4\right)$
$7-4-\left(-3+\left(3-4+\left(-3+5-2\right)\right)+4\right)$
$\sqrt{343}$
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