A satellite of mass \( \dfrac{M}{2} \) is revolving around earth in a circular orbit at a height of \( \dfrac{R}{3} \) from earth surface. The angular momentum of the satellite is \( M \sqrt{\dfrac{GMR}{x}} \). The value of \( x \) is __________, where \( M \) and \( R \) are the mass and radius of earth, respectively. \( (G \) is the gravitational constant).
