Egalité vectorielle (graphique)

Dans le plan muni d'un repère orthogonal (O,I,J), on considère les trois points C, B et D représentés ci-dessous.
Quelles sont les coordonnées du point A tels que AD=CB ? Cliquer sur la figure pour placer le point A.

This is exercise number 1 in a series of 5 exercises.
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