$-\frac{1}{2}x^3y^2+3x^2y^2$
$2x-\sqrt{x+7}=7$
$\left(1100-135\right)+\left(680-75\right)+\left(800-120\right)-267$
$\lim_{x\to-4}\left(\frac{x^2}{\left(x+4\right)^3}\right)$
$\frac{dy}{dx}=16-y$
$4x^2-18x+3$
$\left(x+11\right)\left(x-7\right)$
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