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2. 4x + 4
3. 3z + 10
4. 5x + y + 4
= 42n + 20n + 35m - 50m + 7 + 9
= 62n - 15m + 16
2. (5x + 3) - (x - 1)
= 5x + 3 - x + 1
= 5x - x + 3 + 1 = 4x + 4
3. (2y + 15z) - (4y - 8)
= 2y - 4y + 15z + 8
= -2y + 15z + 8
4. (5z-3) - (2z-7)
= 5z - 2z - 3 + 7 = 3z + 4
5. (x-y) - (6x + 4)
= x - 6x - y - 4 = -5x - y - 4