$9\cdot40$
$\left(k\:+\:3\right)\:\left(k\:-\:3\right)$
$\left(10x^2+6x\right)-\left(4x^2+5\right)$
$\frac{dy}{dx}+y=xy$
$\sqrt{111.11}$
$xy+1=x^3+y$
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