1) In your mind's eye, W is the only variable. Despite all those letters, think of everything else as a number, like 7 or -3, and manipulate it that way. It's just W and a bunch of numbers.
2) Clear fractions (i.e. multiply both sides of the equation by something that removes all fractions from both sides).
3) Multiply out and collect like terms (since it's just W and a bunch of numbers, "like terms" means "like W-terms").
4) Solve for W.