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Sagot :

VINS

bonsoir

x

x + 5

3 ( x + 5 )

= 3 x + 15

x

x - 5

x - 5 + 3 x

= 4 x - 5

3 x + 15 = 4 x - 5

3 x - 4 x = - 5 - 15

- x = - 20

x = 20

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