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I am given a problem with its shallow solution (i.e. not all steps/formulas shown). When I tackled the problem (below), my answer didn't match the apparently correct solution. Where is my mistake? The bold writing is the apparent "correct" answer.

Attempt at problem in question.

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    \$\begingroup\$ Show the material in the question - links can die... \$\endgroup\$ – Solar Mike Aug 27 '17 at 8:22
  • \$\begingroup\$ Image was over 2MB, I feared the writing wouldn't be readable if I resized it smaller... \$\endgroup\$ – howland12 Aug 27 '17 at 8:25
  • \$\begingroup\$ All current directions and nodes were labeled/chosen by me, aside from current Io, which is what the problem asks for. \$\endgroup\$ – howland12 Aug 27 '17 at 8:32
  • \$\begingroup\$ I think I7 equation has a wrong sign ... can't see it very clearly \$\endgroup\$ – Chu Aug 27 '17 at 8:34
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    \$\begingroup\$ You could reduce the size of the matrices by using VE=VB+6, and re-work. That might get rid of the lurking error. Also, as a general rule, I find that summing currents away from a node and equating to zero is less error prone. \$\endgroup\$ – Chu Aug 27 '17 at 9:16

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