Lets say you are trying to find the X in this equation:
2x-8=18 1. find a way to leave the 2x by itself.
2x=26 2. since the 8 is a negative (-8), becase it has a subtraction sighn , you add it to the 18 on the opposite side so yu have the 2x by itself.
3. Now you have to divide since there is nothing else you can do.
You divide 26 by two and then 2 by 2. now you have x=13.
This technique goes the same for if you have more that just two numbers that dont have a variable, but you said two step, so this is a prime example. I hope this helped. :)