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b. 20x - 15y + 7z + 2x - y + 3z = 22x - 16y + 10z = 11x - 8y + 5z
c. 4 - 2(a + 3b) + 5a + 3b - 2 = 4a + 12b - 2a - 6b + 5a + 3b - 2 = 7a + 9b - 2
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