a + 3b - (b-3a) -{a - 2 b - (a + 2 b)}
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Answer:
4a + 6b
Step-by-step explanation:
==: a + 3b - (b - 3a) - {a - 2b - (a + 2b)}
==: a + 3b - b + 3a - {a - 2b - a - 2b}
==: 4a + 2b - (-4b)
==: 4a + 2b + 4b
==: 4a + 6b
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