$\lim_{x\to-4}\left(x^3+x^2-x-1\right)$
$x^2+10x-21=0$
$\frac{9}{\left(x+1\right)^{2}}=-2$
$\left(e^{2a}\right)^2$
$sen^2\:+\:\frac{-28}{53}=1$
$2\log_x\left(7\right)$
$12h-4c+11h+8x-2c-x$
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