My teacher was going over a thevenin and norton circuit and i understand the thevenin and norton part of it, but the part that confused me was when he did the node voltage at the 2 circled nodes to find Ix. I understand why the bottom node would be zero because it is the reference node but why is the top one zero. I have uploaded a picture of the notes and circled the node where i need help with. Since its connected to Vt wouldn't it have some voltage?
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