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2. 4x+4
3. -2y+15z+8
(42n + 35m + 7) - (-50m - 20n + 9)
42n + 35m + 7 + 50m + 20n - 9
42n + 20n + 35m + 50m + 7 - 9
62n + 85m - 2
NOMOR 2
(5x + 3) - (x - 1)
5x + 3 - x + 1
5x - x + 3 + 1
4x + 4
NOMOR 3
(2y + 15z) - (4y - 8)
2y + 15z - 4y + 8
2y - 4y + 15z + 8
-2y + 15z + 8