You can put this solution on YOUR website!
If we want to find x, it is best to have a positive amount of x on the left hand side of the equal sign. So change the sign of all terms:
add 4y to both sides:
divide by 2:
I hope this helps.
Adam
P.S. please visit my website, I only set it up last week and it may be of use to you. The address is http://geocities.com/quibowibbler