Question: isolate a subexpression

Hello, I bought Maple 11 for its algebraic manipulation capabilities, but I can't figure out how to do this: Given, for example, Vs/R1 = (Vs - Vo)/R2 I want Maple to solve for Vo/Vs = ??? I can isolate a single variable (either Vs or Vo), but that is not what I want. Thanks!
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