$\frac{144x^2-36y^2}{16x-6y}$
$\lim_{x\to0}\left(\frac{5^x-9x-7}{2^x-x-2}\right)$
$-14\cdot10$
$66=x-14$
$\frac{x^2+4x+6}{x-2}$
$\left(2x^2+6x+24\right)\left(x+4\right)$
$18x^2=65x-7$
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