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b) 5a - 4b + 2 - 9a - 2b - 5 = -4a - 6b - 3
c) x + 3y - 7z - 3x + 2y - z + 2x - 4y + 2z = y - 6z
d) -2x + 4y - 5z - 2y - 4z + 3x + 3z - 2x + 4y = -x + 6y - 6z