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3a(4a) + 3a(7) - 5(4a) - 5(7)
12a² + 21a - 20a - 35
12a² + a - 35
⇒ (3a) (4a) + (3a)(7) + (-5) (4a) + (-5)(7)
⇒12a² + 21a - 20a -35
⇒ 12a² - a - 35