$x^2\cdot\frac{dy}{dx}+y=-1$
$\frac{dy}{dx}=\frac{x-1}{y^2}$
$\left(5-\sqrt{x}\right)^2$
$x+2-5x$
$4\left(x^2-169\right)$
$20-2r\:t^2\:para\:r=1;\:t=5$
$\frac{3}{x}=\frac{2}{x-1}$
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