$m^2+6m=7$
$-x^2-x^2+x^2$
$\lim_{x\to0}\left(\frac{e^2-2x-1}{1-\cos\left(x\right)}\right)$
$\lim_{x\to-3}\left(\frac{x+5}{x^2-9}\right)$
$-5ydy=3dt$
$\left(3x-2y-4z\right)^2$
$\frac{dy}{dx}=\frac{2x^3y}{-\left(x^4+y^4\right)}$
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