$9x^2-9x+2=0$
$-42+9a-3a$
$8x-x$
$\lim_{x\to3}\left(\frac{x^2-0}{\sqrt{x}-\sqrt{3}}\right)$
$-50\cdot5$
$4xy-2y^2=0$
$\frac{dy}{dt}-3y=e^{2t}$
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