Решите уравнение: 
53,76:(4,248-1,56х)+3,8=55

53,76:(4,248-1,56х)+3,8=5553,76:(4,248-1,56х)=55 -3.8 = 51,253,76 : 51,2 = 4,248-1,56х1,05 = 4,248-1,56х1,56x = 4,248 -1,05 = 3,198x = 3,198 /1,56 = 2,05x =2,05