$\lim_{x\to1}\left(2x^2+x\right)$
$\left(a^2-5^2\right)$
$\left(-\frac{1}{2}xy^2z^3\right)^5$
$18\:x\:6$
$\int\frac{4x-8}{2x^2-8x+4}dx$
$\left(40x^7\right)+\left(-\frac{8}{3}x^7\right)$
$-6c+c-3c-5c$
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