Find the range of `lambda` for which equation `x^3+x^2-x-1-lambda=0` has `3` real solution.

Find the range of `lambda` for which equation `x^3+x^2-x-1-lambda=0` has `3` real solution.
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Find the range of `lambda` for which equation `x^3+x^2-x-1-lambda=0` has `3` real solution.
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