1) х-2/3=5/6х2)1 4/5у=у+43)2/3у-1/3=5/9у4)3/4у-2/3=7/12у

1) х - 2/3 = 5/6х;

x - 5/6x = 2/3;

6/6x - 5/6x = 2/3;

1/6x = 2/3;

x = 2/3 * 6;

x = 4;

Ответ: 4.

2) 1 4/5 у = у + 4;

9/5y = y + 4;

9/5y - y = 4;

9/5y - 5/5y = 4;

4/5y = 4;

y = 5;

Ответ: 5.

3) 2/3у - 1/3 = 5/9у;

2/3y - 5/9y = 1/3;

6/9y - 5/9y = 1/3;

1/9y = 1/3;

y = 3;

Ответ: 3.

4) 3/4у - 2/3 = 7/12у;

3/4y - 7/12y = 2/3;

9/12y - 7/12y = 2/3;

2/12y = 2/3;

1/6y = 2/3;

y = 4.

Ответ: 4.