1)7(2у - 9) - 9у = 7
14у - 9у = 7 + 63
5у = 70
у = 14
х = 2*14 - 9
х = 19
х - 2у = -9
19 - 2*14 = -9
19 - 28 = -9
-9 = -9
2)x= -8-v
-(-8-v)-2v+1=5
8+v-2v+1=5
v=9-5
v=3
x= -8-3
x= -11
1)7(2у - 9) - 9у = 7
14у - 9у = 7 + 63
5у = 70
у = 14
х = 2*14 - 9
х = 19
х - 2у = -9
19 - 2*14 = -9
19 - 28 = -9
-9 = -9
2)x= -8-v
-(-8-v)-2v+1=5
8+v-2v+1=5
v=9-5
v=3
x= -8-3
x= -11