$\left(-2x^4+26x^2-72\right)$
$7.5+3.8+\left(-2.9\right)-\left(-3.2\right)$
$\left(-19+7x-12xy\right)\left(-8-18m\right)$
$\lim_{x\to0}\left(\frac{14lnx-14}{x-e}\right)$
$\frac{\left(2p\right)}{\left(p^{2}+1\right)^{2}}$
$100-y^2x^8$
$\left(2x+y\right)\cdot\left(2x-y\right)$
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