$\frac{d}{dx}x+xy+y$
$\frac{x+7}{\sqrt{x}}$
$n=49-36n^2$
$3x^2+2x-1;x=-1$
$2a+c-3b-7b+4b-8c$
$\frac{dx}{dy}-x^2=-9$
$1-3x>x-2+2x$
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