$\lim_{x\to2}\:\left(\frac{x^2+5x+6}{x-2}\right)$
$\lim_{x\to0}\left(\frac{\sqrt{x+1}-1}{\sqrt{x}}\right)$
$a^2-66a+1080$
$\frac{6\cdot\left(-6\right)-10}{5+\left(-6\right)}$
$\left(a+9b\right)\left(a-2b\right)$
$r+3=3$
$-9.58+\left(+3.3\right)$
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