$9^{-3}\cdot9^4$
$-20\cdot21$
$\left(4x+4\right)\left(5x+4\right)$
$-90+50-72$
$y'-16xy=0$
$\frac{dy}{dx}=\frac{-4xy}{x^2+y^2}$
$\left(+34-45+56\right)-\left(-44\:+56-56\right)$
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