Verified answer

x-y=8

y+z=7

x-z=1

Все складываем

x - y + y + z + x - z = 8+7+1

2x = 16

x = 8

x - z= 1

8 - z = 1

z = 7

x - y = 8

8 - y = 8

y = 0

ответ {8, 0, 7}