Résoudre les équations suivantes DETAILLES :
a) -x = 9
b) -x = -8
c) x + 4 = 9
d) x - 7 = 11
e) 6 + x = -2
f) 11 - x = 4
a) -x = 9
b) -x = -8
c) x + 4 = 9
d) x - 7 = 11
e) 6 + x = -2
f) 11 - x = 4
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b) -x = -8 donc x = 8
c) x + 4 = 9 donc x = 9 - 4 donc x = 5
d) x - 7 = 11 donc x = 11 + 7 donc x = 18
e) 6 + x = -2 donc x = -2 - 6 donc x = -8
f) 11 - x = 4 => -x = 4 - 11 => x = 7