X-2/3=3/2. 2/5+x=1 2/15. (X-2/5)-0,3=2 1/4

х - 2/3 = 3/2;

х = 3/2 + 2/3;

х = 9/6 + 4/6;

х = 13/6;

13/6 - 2/3 = 3/2;

13/6 - 4/6 = 3/2;

9/6 = 3/2;

3/2 = 3/2;

2/5 + x = 1 2/15;

2/5 + х = 17/15;

х = 17/15 - 2/5;

х = 17/15 - 6/15;

х = 11/15;

2/5 + 11/15 = 1 2/15;

6/15 + 11/15 = 17/15;

17/15 = 17/15;

(х - 2/5) - 0,3 = 2 1/4;

(х - 0,4) - 0,3 = 7/4;

х - 0,7 = 1,75;

х = 1,75 + 0,7;

х = 2,45;

(2,45 - 2/5) - 0,3 = 2 1/4;

(2,45 - 0,4) - 0,3 = 1,75;

2,05 - 0,3 = 1,75;

1,75 = 1,75.