First subsystem:
$$C_x + F_{DE} \cos(45) = 0$$
$$C_y + F_{DE} \sin(45) + 20= 0$$
$$F_{DE} \sin(45) \times 25 + 20 \times 150= 0$$Second subsystem:
$$B_x - C_x = 0$$
$$B_y - C_y - A_y - 20= 0$$
$$-F \times 150 + A_y \times 60 - C_x \times 30 = 0$$Third subsystem:
$$-B_x - F_{DE} \cos(45)...