[b/(a-b+c)]+[(2a+c)/(b-a-c)]-[(b-c)/(b-a-c)]

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[b/(a-b+c)]+[(2a+c)/(b-a-c)]-[(b-c)/(b-a-c)][b/(a-b+c)]+[(2a+c)/(b-a-c)]-[(b-c)/(b-a-c)][b/(a-b+c)]+

[b/(a-b+c)]+[(2a+c)/(b-a-c)]-[(b-c)/(b-a-c)]
[b/(a-b+c)]+[(2a+c)/(b-a-c)]-[(b-c)/(b-a-c)]

[b/(a-b+c)]+[(2a+c)/(b-a-c)]-[(b-c)/(b-a-c)]
=[-b/(b-a-c)]+[(2a+c)/(b-a-c)]-[(b-c)/(b-a-c)]
=(2a+c-b-b+c)/(b-a-c)
=[2(a-b+c)]/(b-a-c)
=-2