1) 20-х=3 14/33
х= 20- 3 14/33
х= 16 19/33
проверка: 20- 16 19/33=3 14/33
2) 6 2/15- х= 4 13/15
х = 6 2/15- 4 13/15
х = 1 4/15
Проверка: 6 2/15 - 1 4/15 = 4 13/15
3) х + 7 13/28 = 8 10/28
х = 8 10/28- 7 13/28
х = 25/28
Проверка: 25/28 + 7 13/28 = 8 10/28
4) ( х - 7 2/17 ) - 4 15/17 = 8 12/17
х - 7 2/17 = 4 15/17 + 8 12/17
х = 7 2/17 + 13 10/17
х = 20 12/17
Проверка: ( 20 12/17 - 7 2/17 ) - 4 15/17 = 8 12/17.