(x-1)-2(x-1)=0
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(x-1)-2(x-1)=0
(x-1)-2(x-1)=0
(x-1)-2(x-1)=0
(x-1)^2-3(x-1)+2=0
(x-1-1)(x-1-2)=0
(x-2)(x-3)=0
解得:x=2或3
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