What is the ratio of x to y 3/5=x/x+2y

Assuming that there are no other markings, I will solve this equation using the wonderful order of operations method, PEMDAS.
     3/5 = x / x + 2y
           ↓
     3/5 = (x/x) + 2y
           ↓
     3/5 = 1 + 2y
           ↓
3/5 - 1 = 2y
           ↓
      -.4 = 2y
           ↓
      -.2 = y
           ↓
        y = -1/5

We now know that y = -1/5. I do not know what x equals though, so I cannot fully solve the equation, unfortunately. Hopefully, what I could solve was helpful to you =)