Why does using nodes V1 and Vo give wrong results in op-amp circuit analysis?

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paulmdrdo
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In the problem below, when I use nodes V1 and V2 I get the correct answer of Vo = -2.5v
But when I use nodes V1 and Vo I get an incorrect answer. Please explain to me why my latter method did not work.
Thanks.

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Do you have all the currents going into node Vo?
 
I'd be happy to help if I could read your writing and if you showed where your equations come from.