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Let f(x)=x+2|x+1|+2|x-1|dot If f(x)=k h...

Let `f(x)=x+2|x+1|+2|x-1|dot` If `f(x)=k` has exactly one real solution, then the value of `k` is (a)`3` (b) ` 0` (c)` 1` (d) `2`

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