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= -15i - 31j + 64k
2) (42n + 35m + 7) - (50m - 20n + 9)
= -15m + 62n - 2
3) (5x + 3) - (x - 1)
= 4x + 4
4) (2y + 15z) - (4y - 8)
= -2y + 15z + 8
5) (5z + 3) - (2z - 7)
= 3z + 10
6) (x - y) - (6x + 4)
= - 5x - y - 4