1) 1,5 - (5/6x + 1/3) = 8/9

3/2 - (5/6x + 1/3) = 8/9

3/2 - 5/6x - 1/3) = 8/9

3/2 - 1/3 - 8/9 = 5/6x

приводим к общему знаменателю

27/18 - 6/18 - 16/18 = 15/18x

5/18 = 15/18x

(5/18) / (15/18) = x

(5/18) * (18/15) = x

1/3 = x

2) 5/8y - 1/2 + 1/12y = 1/4

приводим к общему знаменателю

15/24y - 12/24 + 2/24y = 6/24

15/24y + 2/24y = 12/24 + 6/24

17/24y = 18/24

(18/24) / (17/24) = y

(18/24) * (24/17) = y

18/17 =y