$\int\left(5\cos\frac{x}{5}\right)dx$
$-80\cdot30$
$\lim_{x\to1}\left(\frac{x^2-4x-3}{x^2-1}\right)$
$r^2-2r-15$
$\left(a^6+\:7\right)\left(a^6\:-\:9\right)$
$\left(-18\right)-\left(-27\right)-\left(+8\right)\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$2x-x-2y$
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