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  1. solving system with addition/elimination
  2.  
  3. 11c + 3d = -68
  4. 10c + 3d = -64
  5.  
  6. -1(10c + 3d = -64)
  7. -10c - 3d = 64
  8.  
  9. 11c + 3d = -68
  10. -10c - 3d = 64
  11. c = -4
  12.  
  13.  
  14. -10(-4)-3d = 64
  15. 40 - 3d = 64
  16. -3d = 64 - 40
  17. -3d = 24
  18. d = -8
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