Based on Kirchhoff's rules Please solve the system of equations and determine one of the currents

Switch closed Junction Rule at point 8: I. = 1, -I, - Junction Rule al point d: I2 + I, = In loop 1:" E- J. Rs - Iz Rz - I, Ry = 0 loop 2: + I, R21 Ty Ry = 0 loop 3: - R, I, - RT, + R2 1, =0 loop 4: - I, R, - R, I, + I, R, =0