Решите уравнение: 1,2 + 3/10y = 8/15y + 0,78

1,2 + 3/10y = 8/15y + 0,78

1,2 + 3/10y - 0,78 = 8/15y

1,2 - 0,78 = 8/15y - 3/10y

1,2 - 0,78 = 8/15y - 3/10y

1 2/10 - 78/100 = 8/15y - 3/10y

12/10 - 78/100 = 8/15y - 3/10y

120/100 - 78/100 = 8/15y - 3/10y

(120 - 78) / 100 = 8/15y - 3/10y

42/100 = 8/15y - 3/10y

21/50 = 8/15y - 3/10y

21/50 = y (8/15 - 3/10)

21/50 = y (16/30 - 9/30)

21/50 = y ((16 - 9) / 30)

21/50 = y*7/30

y = 21/50 : 7/30

y = 21/50 * 30/7

y = 21/7 * 30/50

y = 3 * 3/5

y = 9/5

y = 1 4/5

y = 1 8/10

y = 1,8

Ответ: 1,8.