2/5=6/x+35/6=15/2x-3

2/5 = 6/x + 35/6 = 15/2x - 3;

Проверим каждое равенство и определим "x";

2/5 = 6/x + 35/6;

6/x + 35/6 = 2/5;

6/x = 2/5 - 35/6;

6/x = 12/30 - 175/30;

6/x = -163/30;

x = 6 (-163/30);

x = 6/1 (-30/163);

x = - 180/163;

Проверим:

6/x + 35/6 = 2/5;

6/(-180/163) + 35/6 = 2/5;

6/1 (-180/163) + 35/6 = 2/5;

6/1 (-163/180) + 35/6 = 2/5;

1/1 (-163/30) + 35/6 = 2/5;

-163/30 + 35/6 = 2/5;

-163/30 + 175/30 = 2/5;

12/30 = 2/5;

2/5 = 2/5;

2-ое равенство;

2/5 = 15/2x - 3;

15/2x - 3 = 2/5;

15/2x = 2/5 + 3;

15/2x = 3 2/5;

2x = 15 3 2/5;

2x = 15/1 17/5;

2x = 15/1 5/17;

2x = 75/17;

x = 75/17 2/1;

x = 75/17 1/2;

x = 75/34;

Проверим:

15/(2 75/34) - 3 = 2/5;

15/75/17 - 3 = 2/5;

15/1 75/17 - 3 = 2/5;

15/1 17/75 - 3 = 2/5;

1/1 17/5 - 3 = 2/5;

3 2/5 - 3 = 2/5;

2/5 = 2/5;