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

Define a continuity of a function at a point. Find all the points of discontinuity of f defined by f(x) = |x| - |x - 1| .

Find all points of discontinuity of f, where f is defined by f(x)={(2x+3"," ,"if" xle2),(2x-3",","if "xgt2):}

Find all points of discontinuity of f, where f is defined by f(x)={{:(x^(6)-2," if "x le1),(x^(2)," if "x gt 1):}

Find all points of discontinuity of f, where f is defined by f(x)={{:(2x^(3)+4," if "x le2),(x^(2)+2," if "x gt 2):}