Due to the lowering of a piston of weight G in a closed

Due to the lowering of a piston of weight G in a closed tank under the action of force P, the liquid rose in the piezometer to a height x (Fig. 7). Determine the value of x, if P = 300 N; G = 200 N; d = 0.1 m; h = 0.4 m; ρ = 1000 kg / m3; g = 10 m / s2.