4ab (a-b) - 6a square (b-b square)-3b square (2a²-a) + 2ab (b-a)
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4ab(a-b) - 6a² (b-b²) - 3b² (2a²-a) + 2ab (b-a)
4a²b -4ab² - 6a²b - 6a²b² - 6a²b² -6ab² + 2ab² - 2a²b
= -4a²b -8ab² -12a²b² - Adding Like Terms
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