The method I used in high school was to write the equation hundreds of times, night after night, until it eventually stuck in my brain. I think it becomes sort of a rhyme or mantra that tends to generate itself in your mind once you start to say it. All you need is a pencil and a dozen sheets of blank paper. Try it!
Once you begin to make sense of maths, you'll find equations become easier and easier to understand and remember.
Good luck!