Đề: ( 7 - | x | ) .( 2x - 4 ) = 0
TH1: 7 - | x | = 0
| x | = 7 - 0
| x | = 7
x = 7 hoặc x = -7
TH2: 2x - 4 = 0
2x = 4
x = 2
Vậy x = 7; x = -7 hoặc x = 2
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