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For x^2-(a+3)|x|+4=0 to have real soluti...

For `x^2-(a+3)|x|+4=0` to have real solutions, the range of `a` is a. `(-oo,-7]uu[1,oo)` b. `(-3,oo)` c. `(-oo,-7)` d. `[1,oo)`

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