How to format cases properly in MS Word? I am desperate
On the Equation Tools tab ,chose liner format and use &amp; to align.
e.g.  

\eqarray(2V_A-5V_C&amp;=-&amp;20@ V_A-6V_B&amp;=-&amp;40@5V_B+6V_C&amp;=&amp;40)  

After you finish edit,change it to pro format,just get what you want.