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= 4a + (-5b) - 5c + 13d
2. A = -6 + 10 - 3m -8m + 4n + 7n
= 4 - 11m + 11n
B = 15a + (-11a) + 7b - 12b - 5c + 13d
= 4a + (-5b) - 5c + 13d
3. A = 5x - 6y + 8z + 7x - 9z - 2y - 9z + 10
= 10 + 5x + 7x - 6y - 2y + 8z - 9z - 9z
= 10 + 12x - 8y - 10z
Maaf kalo salah^^