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= -15i - 31j + 64k
2. (3 - 17x + 35z) + (4x + 23y - 9)
= - 13x + 23y + 35z - 6
3. (42n + 35m + 7) - (50m - 20n + 9)
= - 15m + 62n - 2
4. (x - 1) - (5x + 3) = - 4x - 4
5. (2y + 15z) - (4y - 8) = - 2y + 15z + 8
6. (2z - 7) - (5z - 3) = - 3z - 4
7. (x - y) - (6x - 4) = - 5x - y + 4