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Sagot :

1) n + 40 = 2 * 14
n = -40 + 28
n = -12
2) 40 = 2 * (14 + n)
40 = 28 + 2 n
12/2 = n
n = 6
3) n+40 = 2 * (14 + n )
n+40 = 28 + 2n
12 = n

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