Bonjour j’ai 2 equations que je ne comprends pas 1/ 1-xH= 5 -xH= -5-1 xH=6 et 2/ 4-yH=5 -yH=5-4 yH= -1 J’ai corrigé sans comprendre pourquoi on changeai les signes a la fin vs pouvez m’eclairer svp
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