2010008702

We are given the point $P=[3;-4;-5]$ and planes $\alpha$ by $2x-y-3z-5=0$ and $\beta$ by $3x-2y-4z+3=0$. Find the general form of the equation of the plane $\sigma$ which passes through the point $P$ and is perpendicular to both planes $\alpha$ and $\beta$ (see the picture).