Question 3 Briefly justify the following calculation: 2 -3 -2 2 -3 -2 -1 3 4 = 3 -3 0 -7 -2 8 1 -14 0 21 -3 -2 1 -1 = = 31 -1 0 = -6 = : 78. -14 1 -14 0

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