$16.8-18.6$
$27x^3-1-9x\left(3x-1\right)$
$9x^2-42x+49=0$
$\lim_{x\to11}\left(\frac{\left(x-11\right)^7}{x^2}\right)$
$\frac{dy}{dx}\:+\frac{y}{x+1}=\sin\left(x\right)$
$\frac{x^2+8x+16}{x+4}$
$2800\cdot27$
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