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- solving system with addition/elimination
- 11c + 3d = -68
- 10c + 3d = -64
- -1(10c + 3d = -64)
- -10c - 3d = 64
- 11c + 3d = -68
- -10c - 3d = 64
- c = -4
- -10(-4)-3d = 64
- 40 - 3d = 64
- -3d = 64 - 40
- -3d = 24
- d = -8
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