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x² + 6x - 7 = 0
x 7 -------> (x + 7)
x -1 -------> (x - 1)
⇒ (x + 7)(x - 1) = 0
Entonces:
x + 7 = 0
x = -7 -------> solución 1
x - 1 = 0
x = 1 -------> solución 2
RTA:
⇒ x = { -7 ; 1}