18=3y+3 6x+10=5x+15 -5n-16=3n 8-5n=10-4n 9m-8=6m+7 56-9n=-5n 15-8x=2-9x -6m+32=2m 10z+7=9z+5 10-9y=70-6y

18=3y+3
3y=18-3=15
y=15:3=5

6x+10=5x+15
6x-5x=15-10
x=5

-5n-16=3n
3n+5n=-16
8n=-16
n=-16:8=-2

8-5n=10-4n
-4n+5n=8-10
n=-2

9m-8=6m+7
9m-6m=7+8
3m=15
m=15:3=5

56-9n=-5n
-5n+9n=56
4n=56
n=56:4=14

15-8x=2-9x
-8x+9x=2-15
x=-13

-6m+32=2m
32=2m+6m
8m=32
m=32:8=4

10z+7=9z+5
10z-9z=5-7
z=-2

10-9y=70-6y
-9y+6y=70-10
-3y=60
y=-60:3=-20