r 2s - 5t = -1 21. 3a + c = 23 r + 2s - 2t = 5 4a + 7b - 2c = -22 4r + s + t = -1
Chapter 4, Problem 20(choose chapter or problem)
r 2s - 5t = -1 21. 3a + c = 23 r + 2s - 2t = 5 4a + 7b - 2c = -22 4r + s + t = -1
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