$\frac{x^3+6x^2}{x^2+1}$
$\left(x+4\right)\left(2x-8\right)-2x^2$
$5\left\{16-\left(-7\right)-\left[2+\left(\left(-5\right)\right)\right]\right\}$
$\int\left(-4\right)x^4e^{3x^5+\left(50\right)}dx$
$\int - 3 x ^ { 7 } d x$
$65-\:\left(-80\right)$
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