Ответ:
Пошаговое объяснение:
13/15z-(7/9+1/3z)=7 2/9
13/15z - 7/9 - 1/3z = 7 2/9
8/15z - 7/9 = 7 2/9
8/15z = 7 2/9 + 7/9
8/15z = 8
z = 8 * 15/8
z = 15
0
3/(x+2)>=1
3/(x+2)- 1>=0
3-(x+2)/(x+2)>=0
-x+1/(x+2)>=0
(x-1)/(x+2)<=0
x = (-2;1]
Сумма целых: - 1+0+1=0.