Solve the following for x:

a) b/(x-a) = 2b/(x+a)

b) (p-q*x)/t + p = (q*x-t)/p

With b) I did this:

(p-q*x)/t - (q*x-t)/p = -p

(p(p-q*x)-t(q*x-t))/pt = -p

I don't even know if thats right. But I got stuck and couldn't go any further. I just need someone to help me through the steps. Thanks.