Help with rearranging equations!!!!!!?

now i do listen at school and ask for help ect i just always seem to forget.
and i need a method that will easily stick in my brain so when look at it i automatically think "i know what to do its..." instead of "is it this method or no its this..." ect.

examples of the questions i am stuck on are:

x2=5y
2v+x=w

and another example of one is:

x^2
------
2 =w-y


and on both of those i have to make x the subject.
thankyou