$\frac{9yx^2}{3xy}$
$x^8-1\:sobre\:1\:+\:x^4$
$\left(+\:9\right)\:+\left(+\:11\right)\:\:+\left(+\:20\right)\:+\left(\:+\:6\right)$
$\int e^{7x}dx$
$\tan\left(60\right)=\frac{x}{150}$
$z^2+12z+36$
$y^2+24y-144$
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