What's your dad got to do with this; your math teacher?

And why call there "proportions"?

To start, your equation needs a set of brackets:

2y / (y - 3) = -1 / y

Your 2y^2 = -y + 3 is correct; go 1 step further:

2y^2 + y - 3 = 0

Now solve that for y, by factoring or the quadratic formula.