$\lim_{y\to5}\left(\frac{y^2-25}{5-y}\right)$
$y=y^2-1$
$x-\frac{1}{x}-3=0$
$\int\left(2x\left(x+1\right)^5\right)dx$
$\log_x\left(81\right)=12$
$7-7t=28$
$x^2+10x+27\ge0$
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