$\left(2x^2-10x\right)$
$81\:a^4\:-16\:b^2$
$2\left(-2x-6y-z\right)$
$2x-11\le5x+6$
$\int_{-\infty}^{-1}\left(x\cdot e^{-x^2}\right)dx$
$m^2+3m-\frac{27}{m-1}$
$2c^3+3c^2-2c-3$
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