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−(7xy−1)(1+7xy)
1 - 49x²y²
- 49x²y² + 1
1² - (7xy)²
(1 - 7xy) (1 + 7xy)
(- 7xy + 1) (7xy + 1)
Solución :
(- 7xy + 1) (7xy + 1)