Réponse:
x^2+12x=(x+6)^2-36
x^2+12x=x^2+12x+36-36
x^2+12x=x^2+12x
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Réponse:
x^2+12x=(x+6)^2-36
x^2+12x=x^2+12x+36-36
x^2+12x=x^2+12x