What's 9s + 3=57?

What's 4d + 6 = 42

-3y + 12 = - 48

These are 2 step equation I need the senders to

9s + 3 = 57 Subtract 3 from each side

9s = 54 Divide each side by 9

s = 6

4d + 6 = 42 Subtract 6 from each side

4d = 36 Divide each side by 4

d = 9

-3y + 12 = - 48 Subtract 12 from each side

-3y = - 60 Divide each side by - 3

y = 20

9s + 3=57

9s=57-3

9s=54

s=54/9

s=6

2) 4d + 6 = 42

4d=42-6

4d=36

d=36/4

d=9

3)

-3y + 12 = - 48

-3y=-48-12

-3y = - 60

3y=60

y=60/3

y=20