[(6a² - 10ab)] +2a] - [12ab-9b²) + 3b]
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Answer:
{(6a² - 10ab)/2a} - {(12ab - 9b²)/3b}
= {2a(3a - 5b)/2a} - {3b(4a - 3b)/3b}
= (3a - 5b) - (4a - 3b)
= 3a - 5b - 4a + 3b
= -a - 2b
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