$6 = 35$
$\lim_{b\to2}\left(\frac{b^3-8}{b^2-4}\right)$
$2x^2+x-5=0$
$\lim_{x\to-5}\left(\frac{x+5}{x^2+9x+20}\right)$
$\left(9y^3a\right)^3$
$\frac{\left(2x-1\right)\left(x+2\right)}{\left(x+3\right)\left(x-1\right)}=0$
$\int\frac{21x-15}{x^2-x-2}dx$
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