$2\:+\:\sqrt{2x+1}\:=\:x$
$\frac{dy}{dx}=ye^x$
$xy=x^2+x+y$
$( x + 8 ) ( x - 3 )$
$4\cdot14$
$81^2$
$\left(3x^2-7x+5\right)\::\:\left(x^2-x+1\right)$
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