$\frac{d}{dx}x^2+y^2-xy=21$
$3\cdot\left(g-4v\right)$
$20^{-2}\cdot20^2$
$y=\left(4x-2\right)\left(7x+8\right)$
$x^2-5x-36<0$
$-x^2+x-2$
$12x^4y^2\cdot7x^3y$
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