Now I'm a bit confused. Okay. But please have a look on link #2 in the first post of mine above (please have a look at the bottom the part highlighted orange). The current flows from left of screen towards right (towards V2) - at least this was my original assumed current. The current flows from higher potential to lower. So, don't you think Vx, the point between R3 and 12V supply, should be subtracted from V1 because current flows from it which means higher potential. i.e. V1 - Vx. Then, the current flows through the 12V supply toward V2 which means V2 is lower potential point, then won't we right 12-V2. Then, Vx=12-V2. The end form would be: V1-Vx = V1-(12V-V2) = V1-12V+V2. Please guide me on this.