|x+2|=|x-2|
<=> có 2 TH:
TH1:x+2=x-2<=>x-x=2+2<=>0=4( vô lí)
TH2:x+2=-(x-2)=-x+2<=>-x-x=2+2<=>-2x=4<=>x=-2
Vậy x=-2
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