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Sagot :

Bonsoir,

12-x=3x

12-12-x-3x=3x-3x-12

-2x=--12

-2x/-2= -12/-2

x=6

12-x=3x
Soit 12-x-3x = 0
12-4x=0
-4x=-12
X = -12/-4 =3

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