z=7+y
z−2y+2=4
z - у = 7 | × (-2)
z −2y = 2
-2z + 2y = -14
-z = -12
z = 12
12 - y = 7
y = 12 - 7
y = 5
ответ: 5; 12.
z=7+y
z−2y+2=4
z - у = 7 | × (-2)
z −2y = 2
-2z + 2y = -14
z −2y = 2
-z = -12
z = 12
12 - y = 7
y = 12 - 7
y = 5
ответ: 5; 12.