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8ab - 4a + b + (3b - 5a + ab)
8ab - 4a + b + 3b - 5a + ab
9ab - 9a + 4b
2. Pengurangan
8ab - 4a + b - (3b - 5a + ab)
8ab - 4a + b - 3b + 5a - ab
7ab + a - 2b