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Sagot :

(x-1)=2(x-1)
x-1=2x-2
x-2x=-2+1
-x=-1
x=1
(x-1)=2(x-1) --> (x-1)=2x-2 --> x-1-2x=-2 --> -x=-2+1 --> x=-1/-1 --> x=1

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