$-x+4y-3z=-3\:\:\:\:$
$x\cdot\frac{du}{dx}=-u^2$
$2y^2-5+1+2y^2-6y^2-3-4y$
$\frac{d}{dx}\left(\frac{1}{2}e^{-2x}+2\right)$
$\lim_{x\to0}\left(\frac{x-\cos\left(x\right)}{x^4}\right)$
$\lim_{x\to0}\left(\frac{\left(b+x\right)^2-b^2}{x}\right)$
$32 + x = - 83$
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