5 l9-5nl -7 =38
Add 7 to both sides of the equation:
5 l9-5nl -7 +7 = 38 +7
5 l 9 -5n l = 45
Divide both sides by 5
(5 l 9 -5n l ) /5 = 45/5
l 9 - 5n l = 9
Now, we have 2 solutions:
9-5n = 9
And
9-5n = -9
Solve each one
9-5n = 9
9-9 = 5n
0 = 5n
n= 0
9-5n = -9
-5n = -9-9
-5n= -18
n= -18/-5
n= 3.6