$\frac{a}{a+1}-1$
$x\frac{dx}{dy}+y=\frac{1}{y^2}$
$x^2+8x-48$
$\lim_{x\to\infty}\left(\frac{x^2-441}{357-4x-x^2}\right)$
$\frac{dy}{dx}x^{6y}=y^{7x}$
$\frac{x-2}{3x+5}<4$
$\left(9x^a+4b^y\right)\left(9x^a-4b^y\right)$
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