7.-5(3z+1)-11=-1
-15z-5-11=-1
-15z=-1+5+11
-15z=15
15z=-15
z=-1
8.-8n+4=-2(5n+6)
4=8n-10n-12
20=-2n
2n=-20
n=-10
9.20+30k=20+k
30k-k=20-20
29k=0
k=0
10.26-5m=2-9m
9m-5m=2-26
4m=-24
m=-6
11.9z+11=13z-1
9z-13z=-1-11
-4z=-12
4z=12
z=3
12.12a+31=23a-2
12a-23a=-2-31
-11a=-33
11a=33
a=3
13.2(x-2)-1=5(x-2)-7
2x-4-1=5x-10-7
2x-5x=5-17
-3x=-12
3x=12
x=4
14.-y+20=y
-y-y=-20
2y=20
y=10
15.4(2y-6)=4y-4
8y-24=4y-4
8y-4y=24-4
4y=20
y=6
7.-5(3z+1)-11=-1
-15z-5-11=-1
-15z=-1+5+11
-15z=15
15z=-15
z=-1
8.-8n+4=-2(5n+6)
4=8n-10n-12
20=-2n
2n=-20
n=-10
9.20+30k=20+k
30k-k=20-20
29k=0
k=0
10.26-5m=2-9m
9m-5m=2-26
4m=-24
m=-6
11.9z+11=13z-1
9z-13z=-1-11
-4z=-12
4z=12
z=3
12.12a+31=23a-2
12a-23a=-2-31
-11a=-33
11a=33
a=3
13.2(x-2)-1=5(x-2)-7
2x-4-1=5x-10-7
2x-5x=5-17
-3x=-12
3x=12
x=4
14.-y+20=y
-y-y=-20
2y=20
y=10
15.4(2y-6)=4y-4
8y-24=4y-4
8y-4y=24-4
4y=20
y=6