$-\left(8+4\right)+\left(5-9\right)$
$\left(-d+b\right)^2$
$\frac{dy}{dx}=-4\left(y-9\right)$
$\frac{x-2}{4}=-3$
$\int\frac{2x^2-5x+4}{x^2\left(x-4\right)}dx$
$\frac{d}{dx}x^2+y^2-xy=21$
$\left(x+5\right)\left(x-z\right)$
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