Help needed with a question about labeling forces on a suspended mass, specifically b.

mass m is mounted in a wall on one side, and on the other side there is a roll and a counterweight of mass M. a} Label the forces in the sketch: Label the weight of the mass M as FM; the weight of the mass m as Fm; the force along the suspension cable to the left of m as F1 and the force to the right as F2. b] The suspension of the roll is exerting a force FR on the roll such that it does not move. How can this force be expressed in terms of the forces introduced in a)? Determine the force and add it to the sketch