Hey there!
First, reorder the terms:
-.03+1.3n= -9
Then move the terms that contain an "n" to the left, and all with no variables to the right
Add -.03 to each side
-.03+-.03+1.3n= -9+.03
Combine the like terms
0.00 + 1.3n = -9 + 0.03 1.3n = -9 + 0.03 -9 + 0.03 = -8.97 1.3n = -8.97
Then divide each side by 1.3 and you will get
n= -6.9
Hope this helps! :)