Bonjour pouvez-vous m'aider svp à résoudre les équations suivantes: a) - 2x + 7 = - x + 9
b) 4 x - 21 = 7 x - 9
c) - 7 x - 12 = 8 x + 3
d) 7x +13= -3x -7
e) 7a-8 = 3a+7
f) -2a+3 =14a-1
g) 3a -4 = -5a - 8
h) 7a-6=9a - 11
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