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I'm confused to what signs should I use when there's a voltage source in the loop.

The problem:

I already know the answer from the solutions but what I found is at V_0 :

(V0 - 60V)/12 + V0/12 + (V0 -24V)/6 = 0

This is horrendously incorrect but I can't understand why . I know current flows from higher potential to lower so if that was the case then my first term would be correct (matches solution) ; the 2nd term is also correct (V0-0V)/12 but the last term is incorrect. The correct term would be (VO - (-24V))/6 and I really don't know why? Can someone explain that to me? Even for the first term, I just got lucky by putting the correct sign but I want to know why and how does the sign vary.

Oh and if anyone wants the answer , V0= 3V. Power in resistors are easy to find once the currents and voltages are found.

Thanks,

GT