bonjour
x
x - 7.9
x - 7.9 - 4.2 = x - 12.1
x - 12.1 + 6.4
= x - 5.7
si on choisit 7 ; 7 - 5.7 = 1.3
si on choisit - 2 = - 2 - 5.7 = - 7.7
x - 5.7 = - 1.4
x = - 1.4 + 5.7
x = 4.3
ona choisi 4.3
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bonjour
x
x - 7.9
x - 7.9 - 4.2 = x - 12.1
x - 12.1 + 6.4
= x - 5.7
si on choisit 7 ; 7 - 5.7 = 1.3
si on choisit - 2 = - 2 - 5.7 = - 7.7
x - 5.7 = - 1.4
x = - 1.4 + 5.7
x = 4.3
ona choisi 4.3