$\frac{36m^{2}-49n^{2}x^{4}}{6m-7nx^{2}}$
$\frac{x^3+4x^2-x-4}{x+4}$
$x+8\ge-5$
$e^y\frac{dy}{dx}=2x$
$\lim_{x\to-\infty}\left(\frac{3x^4+6x^3}{2x^3+3x}\right)$
$\left(4m^5-5n^3\right)^2$
$\left(-3\right).\left(9\right).\left(-5\right)$
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