$\left(-8+4\right)-\left(-10+8\right)$
$\left(\frac{1}{2r^6}\right)^{-6}$
$-38656\::\:\left(+604\right)$
$2-108$
$\int\frac{8x^3}{\left(x^2+2\right)^2}dx$
$10\left(7x+45\right)+4\left(5x+9\right)+15$
$\frac{x}{2}+7\le-12$
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