Ярослав8 лет назад
3 - х/7 = x/3;
- х/7 - х/3 = - 3;
- (х * 3 / 7 * 3) - (х * 7 / 3 * 7) = - 3;
- 3х/21 - 7х/21 = - 3;
- 10х/21 = - 3;
- 10х = - 3 : 1/21;
- 10х = - 3 * 21/1;
- 10х = - 63;
- х = - 63 : 10;
- х = - 6,3;
- х * (- 1) = - 6,3 : (- 1);
х = 6,3;
3 - 6,3/7 = 6,3/3;
21/7 - 6,3/7 = 6,3/3;
14,7/7 = 6,3/3;
44,1/21 = 44,1/21.