What am I doing wrong? (superposition)

I might be doing this right, but I'm not sure.

details

excuse me could you give us more details or explanation!

yeah sure: The circuit at the very top is the circuit I'm supposed to solve for Vsub0. The part bracketed i1 is where I'm trying to find the first current source's contribution to vsub0. So I kill the second current source, and then do a source transformation. Then I used voltage division to come up with vsub0

The second bracket is where I'm looking for isub2's, the second current source's contribution to vsub0. I killed the other current source and source transformed it similarly to the other one. Then I used voltage division again.

Then finally I added both of the contributions. We only discussed this in class for aabout 5 minutes, so I'm unsure if I'm doing it right.

I didn't check your math, but your method is correct.

correct

I checked your math and your method , all is correct!

The most important thing in your solving is that you paid attention to the sign marks (+,-) of currents and voltage generator.