847
(1)
4/7 (х - 1) = 2/7 + х
4/7х - 4/7 = 2/7 + х
- 3/7х = 6/7
-х = 6/7 : 3/7
-х = 6/7 * 7/3
-х = 2
х = -2
Ответ: -2
(3)
5 (х - 1,5) = 4 2/3 х - 8 3/14
5х - 7,5 = 4 2/3 х - 8 3/14
5х - 4 2/3 х = - 8 3/14 + 7,5
1/3 х = - 8 3/14 + 7 7/14
1/3 х = - 5/7
х = - (5/7 : 1/3)
х = - (5/7 * 3/1)
х = - 15/7
х = - 2 1/7
Ответ: - 2 1/7