$81\cdot2$
$\int\frac{6x+2}{7x^2+2x}dx$
$\frac{dy}{dx}+2x=14$
$\lim_{x\to2}\left(\frac{\sqrt{4-x^2}-\left(x-2\right)}{x^2-4}\right)$
$25c^2+60c+36$
$\frac{9x^3+6x^2+7}{3x^2}$
$\left(7x+6\right)\left(49x^2-42x+36\right)$
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