Try to write it as many time as possible.. and also discuss with any expert that how the eqn framed.. u need to learn the methods to solve the eqn..   
1 5 1
mark it as the best :)
surely why not ?
Then listen to Mom always :)
that i m doing from childhood...........
Still not yet marked as best its near to Thank You on my answer..
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Try to understand the concept behind the equation if you can. Or if you're the kind to mug up equations and formulae learn them daily, write and see. Read another subject and then again try to suddenly recollect the formula in your mind. This will give you more retention capacity