bonjour
si (x+1) / (3-x) = 1
alors x + 1 = 3 - x
soit 2x = 2
x = 1
on a bien (1+1) / (3-1) = 2/2 = 1
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bonjour
si (x+1) / (3-x) = 1
alors x + 1 = 3 - x
soit 2x = 2
x = 1
on a bien (1+1) / (3-1) = 2/2 = 1