$5a^2+6a+8+2a^2+9+4a+3a-1+a^2+a-5$
$8u+6u$
$x^2+2x-168=0$
$\frac{dy}{dx}=\frac{7-x^2}{y^2}$
$10m^2-13m-3$
$3^3x\:3^5:\:3^2$
$\frac{dy}{dx}\left(e^{-y}\right)+cos\left(x\right)=0$
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