$x-5<7x+31$
$60-a^2-7a$
$\lim_{x\to\infty}\left(\frac{\left(5x+9\right)}{6x^2+7x-8}\right)$
$3\left(x^2-1\right)=0$
$x^{2}-400y^{2}$
$-6a+6$
$\frac{dy}{dx}-x^3=10$
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