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4a² - b² = (2a + b)(2a - b)
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(a - b + 2)(a + b + 2)
3(4a+b+2c)
5ab-2ab+4a-b+5b = 3ab+4a+4b
(4a - 3b)(4a + 3b)
(ab/b) / (4a/5b) =(ab / b) * (5b / 4a) = (5ab2 / 4ab)= 5 / (4b)