$\frac{2-x}{5}-\frac{x-12}{20}=-\frac{2x-3}{4}$
$\frac{d^3y}{dx^3}y=\frac{3}{\left(x-1\right)^2}$
$\tan^2x-\frac{1}{3}=0$
$\frac{x-4}{x}\le8$
$4\cdot5-6\cdot3$
$x^2+y^2\:t=2$
$log\left(x-1\right)-log\left(x+3\right)=-logx$
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