$\frac{2x-1}{\frac{1}{x+1}}$
$\frac{dy}{dx}=2e^{2y+3x}$
$-32\:=\:-4b$
$1.5+x\:=\:0$
$\int\left(\frac{1}{z\sqrt{z}^2+9}\right)dz$
$9a^4+81a^2b^2+729b^4$
$xy'+2y=9x$
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