$6t+7-2+7$
$\lim_{x\to2}\left(\frac{sen\:\left(\pi x\right)}{x^3-8}\right)$
$x2-4c-320=0$
$f\left(x\right)=\frac{x}{16+x^4}$
$\left(6-8\right)^2-5$
$4w\:-\:6\:-\:9w\:+\:3$
$-9n+21$
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