$\lim_{x\to3}\frac{t^2-9}{t^2-5t+9}$
$72=-16t^2+72t$
$\frac{x}{3x^2}$
$\lim_{x\to0}\left(\left(\frac{3x}{5x-11}\right)\right)$
$2p^'-7p=8$
$36x^2-144x+72$
$x^2+8x+8=3x+2$
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