Find all the points of discontinuity of f defined by `f(x) = | x | - | x + 1 |`.

Explanation

The given function is `f(x)=|x|-|x+1|`


The two functions `g` and `h` are defined as `g(x)=|x|` and `h(x)=|x+1|`


Then `f=g-h`


The continuity of `g` and `h` is examined first `g(x)=|x|` can be written as


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