The -30 is the one I need help on

First you want to lay out the equation:
1. -30 = w + 8
Next you want to subtract 8 from each side
2. -30 = w + 8
-8 = w - 8
Then you want to add -30 and -8
3. -30 + -8 = -38
This is your answer
4. -38 = w
Or this could be written as:
5. w = -38