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

Let `f(x)=x+2|x+1|+2|x-1| .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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