Respuesta:
[tex] {a}^{2} + a - 1 - {a}^{2} + a - 1 = 2a - 2 = 2(a - 1)[/tex]
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Respuesta:
[tex] {a}^{2} + a - 1 - {a}^{2} + a - 1 = 2a - 2 = 2(a - 1)[/tex]