12. Quelle est la propriété ou la règle appliquée à chaque étape ? - 10 + (-3) + 3 + 2 + (-10) = -10 + [(-3) + 3] + 2 + (-10) = -10 + 0 +2 + (-10) = -10 + 2 + (-10) = -10 + (-10) + 2 = [-10 + (-10)] + 2 = -20 + 2 = -18​
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