<p>M and R be the mass and radius of a disc. A small disc of radius R/3&nbsp; is removed from the bigger disc as shown in figure. The moment of inertia of remaining part of bigger disc about an axis AB&nbsp; passing through the centre O and perpendicular to the plane of disc is&nbsp;<span class="equation">\(\frac{4}{x}MR^2\)</span>. The value of x is ____________.</p>

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