Ответ Автор - hisava ( 23/20 - x ) - 5/12 = 1/323/20 - x = 1/3 + 5/1223/20 - x = 4/12 + 5/1223/20 - x = 9/12 23/20 - x = 3/4 x = 23/20 - 3/4 x = 23/20 - 15/20 x = ( 23 - 15 ) / 20 x = 8 / 20 x = 2 / 5