$18a^2\:-61ab-8a^2+210-51ab-31+a^3-3ab$
$18+7b+16b+4-3b$
$x\ln\left(x\right)y'+y=3x^3$
$\sqrt{t}\left(6-t^6\right)$
$\frac{2k-3}{x-1}+\frac{3kx-2}{x+1}=2k+3$
$-x^2+4x-1$
$x^2+x+10=0$
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