Решите уровнение 20 балов
2/3(6.9c-1/2d)-4.1*5/8c+10.25d 2/3*6.9c-1/3d-4.1*0.625c+10.25d 23/5c-1/3d-2.5625c+10.25d 2.0375c-1/3d+41/4d 2.0375c+119/12d