Bonjour
Soit x le nombre choisi au départ :
1) x - 6 = 15
x = 15 + 6
x = 21
2)
x - 8 = - 5
x = - 5 + 8
x = 3
3)
x - (- 9) = - 2
x + 9 = - 2
x = - 2 - 9
x = - 11.
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Bonjour
Soit x le nombre choisi au départ :
1) x - 6 = 15
x = 15 + 6
x = 21
2)
x - 8 = - 5
x = - 5 + 8
x = 3
3)
x - (- 9) = - 2
x + 9 = - 2
x = - 2 - 9
x = - 11.