Решите уравнение (6,111y+3,889y):0,6=12,43
(6,111y+3,889y):0,6=12,43; 10y:0,6=12,43; 10y=12,43*0,6; 10y=7,458; y=7458:10; y=0,7458. ПРОВЕРКА: 10*0,7458:0,6=12,43.