$x^2+x-13$
$340+1000+645$
$5x^2+x-21>0$
$12x-4y-3z+20-7x+15y-10-2z-3x$
$\lim_{x\to-0.00001}\frac{sin3x}{tan2x}$
$e^{2x}\frac{dy}{dx}=y-ye^{3x}$
$\left(e^x+e^{-x}\right)\frac{dx}{dy}=y^2$
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