Solve the following differential equation: `x(dy)/(dx)-y+xsin(y/x)=0`

Explanation

$$ x \frac{d y}{d x}-y+x \sin \left(\frac{y}{x}\right)=0 $$
Let `y=v x`
$$ \frac{d y}{d x}=v+x \frac{d v}{d x} $$
$$
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