Réponse :
x + 21 = 10
x + 21 - 21 = 10 - 21
x = -11
x - 13 = 6
x - 13 + 13 = 6 + 13
x = 19
Bonjour
X+21=10
X=10-21
X=-11
X-13=6
X=6+13
X=19
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Réponse :
x + 21 = 10
x + 21 - 21 = 10 - 21
x = -11
x - 13 = 6
x - 13 + 13 = 6 + 13
x = 19
Bonjour
X+21=10
X=10-21
X=-11
X-13=6
X=6+13
X=19