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9n-21=4n+4
9n-4n=4+21
5n=25
n=25/5
n=5
4.5m=11-2.5m
4.5m+2.5m=11
7m=11
m=11/7
8x-4=3+7x
8x-7x=3+4
x=7
11-y=y+5
-y-y=5-11
-2y=-6
y=-6/-2
y=3
1-2u=u+13
-2u-u=13-1
-3u=12
u=12/-3
U=-4