3 - 5n = -22
You're essentially just trying to get "n" isolated, or by itself.
So, in order to do that, we must move anything that doesn't have a variable in it onto the other side of the equal sign.
To do that, we must subtract 3 from both sides.
-5n = -22 - 3
Then, we simplify our equation.
-5n = -25
Then, we have to divide both sides by -5, so that we get the answer for "n."
-5n ÷ -5 = -25 ÷ -5
Simplify this.
n = -5
~Hope I helped!~