Alright, so.. I'm currently confused when it comes to solving simple eqautions like

11n = 10n + 21

or

17z = 16z + 8

or even

-36 = y + 12

I dont need to know how to do those problems, but I need to know when to do what.

Like in the first equation, Do I use division? subtraction ? addition ? What type of equations do I use what kind of operators.