(3b-7)² - (4b+5)²
(3b-7-(4b+5))•(3b-7+(4b+5))
(3b-7-4b-5)•(3b-7+4b+5)
(-b-12)•(7b-2)
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(3b-7)² - (4b+5)²
(3b-7-(4b+5))•(3b-7+(4b+5))
(3b-7-4b-5)•(3b-7+4b+5)
(-b-12)•(7b-2)