[abc-9][abc+11] using the identity
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(ABC — 9)×(ABC + 11)
= (ABC) ² + (11—9)×(ABC) — 11×9
= (ABC) ² +2ABC — 99
= (ABC) ² + (11—9)×(ABC) — 11×9
= (ABC) ² +2ABC — 99
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