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If f(x)={(x-4)/(|x-4|)+a ,\ \ \ if\ x<4a...

If `f(x)={(x-4)/(|x-4|)+a ,\ \ \ if\ x<4a+b ,\ \ \ if\ x=4(x-4)/(|x-4|)+b ,\ \ \ if\ x >4` is continuous at `x=4` , find `a ,\ b` .

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