Here's the math problem that I need help with. I am supposed to identify the properties with each step.

(9-b) - 4 = [9 + (-b)] -4

= [9 + (-b)] + (-4)

= 9 + [(-b) + (-4)]

= 9 +[-4 + (-b)

= [9 + (-4)] + (-b)

= 5 + (-b)

= 5 - b

a.

b.

c.

d.

e.

f. substitution

g.

I'm not that great with properties, so if you could explain your answer, that would be great!