(2,7y+3,08y):1,7-3,08=12,22
(2,7y+3,08y):1,7-3,08=12,22 5,78y:1,7-3,08=12,22 5,78y:1,7=15,3 5,78y=26,01 y=26,01:5,78 y=4,5