Since you didn't give the options, we'll answer In steps and you can pick which step you have as an answer choice...
16 = -9 + z
Add 9 to each side for
16 + 9 = z (that's one option)
Add like terms for
25 = z (there's another)
You could also go a whole different route and take the original equation
16 = -9 + z
subtract z from each side for
16 - z = -9
Any of those would be another way to express the equation.