For equilibrium, first, the net force must be zero.  Taking components along the y-axis, we therefore need  n - F₁ - F₂ - F₃ = 0. And, second, the net torque about any pivot must be zero! Taking torques about the actual pivot P, for equilibrium we would have to have, with the direction into the screen taken as positive, F₁d₁ + F₂d₂ - F₃d₃ = 0.