1. 63-8n=n
-8n-n=-63
-9n=-63
n=7
2. 28-9n=-8-10n
-9n+10n=-8-28
n=-36
3, 4у+7=5у+4
4у-5у=4-7
-у=-3
у=3
4. 56-9n=-5n
-9n+5n=-56
-4n=-56
n=14
5. 10-11n=15-12n
-11n+12n=15-10
n=5
6. 35-11m=3m+21
-11m-3m=21-35
-14m=-14
m=1
7. 15-8х=2-9х
-8х+9х=2-15
х=-13
8. -9z+32=7z
-9z-7z=-32
-16z=-32
z=2
9. 10-9y=70-6y
-9y+6y=70-10
-3y=60
y=-20
10. 25-12m=45-8m
-12m+8m=45-25
-4m=20
m=-5