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Réponse:
Bonjour !!!!
2(y+3)-9(y-3) = -3(-y-7)
2y+2*3-9y+9*3 = +3*y+3*7
2y+6-9y+27 = 3y+21
-7y+13 = 3y+21
-7y-3y = 21-13
-10y = 8
y = 8/-10 alors y = -4/5
Réponse:
Bonjour !!!!
2(y+3)-9(y-3) = -3(-y-7)
2y+2*3-9y+9*3 = +3*y+3*7
2y+6-9y+27 = 3y+21
-7y+13 = 3y+21
-7y-3y = 21-13
-10y = 8
y = 8/-10 alors y = -4/5