(a-2b+3c)/(a+b-c)-(a-b+c)/(a-c+b)+(2c-d)/(c-a-b)
=(a-2b+3c)/(a+b-c)-(a+b-c)/(a+b-c)-(2c-d)/(a+b-c)
=(a-2b+3c-a+b-c-2c+d)/(a+b-c)
=(-b+d)/(a+b-c).
(a-2b+3c/a+b-c)-(a-b+c/a-c+b)+(2c-d/c-a-b)
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