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From Lousy Camel, 6 Years ago, written in Matlab M-file.
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  1. R1 = 1;
  2. R2 = 1;
  3. R3 = 1;
  4. R4 = 1;
  5. R5 = 1;
  6. R6 = 1;
  7. R7 = 1;
  8.  
  9. E1 = 10;
  10. E2 = 20;
  11. E3 = 30;
  12. E4 = 40;
  13.  
  14. I1 = 1;
  15.  
  16. A = [((1/R4)+(1/R2)+(1/R7)) (-(1/R7)) (-(1/R2));
  17.          (-(1/R7)) ((1/R7)+(1/R4)+(1/R5)+(1/R6)) (-(1/R4));
  18.          (-(1/R2)) (-(1/R4)) ((1/R2)+(1/R3)+(1/R4))];
  19.      
  20. B = [(-(E3/R7)-(E1/R1));
  21.          ((E2/R6)-(E1/R5)+(E3/R7)-I1);
  22.      I1];
  23.      
  24. C = inv(A)*B;