$\frac{2x+x^2}{x+3}$
$7s\cdot8s^5$
$5x^2+19x-4=0$
$\frac{1}{5}\log\left(x+5\right)=\log\left(2\right)$
$x^2+y^2=49$
$\frac{d}{dx}-y^2-x^2y-x^2=-2$
$raiz\left(y+9\right)$
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