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a+b+c-a+b+c-a-b+c+a-b+c
R.4c
(a+b-c)+(a-b+c)-[(a+b+c)-(a-b-c)]
= a+b-c+a-b+c-(a+b+c-a+b+c)
= a+b-c+a-b+c-a-b-c+a-b-c)
=2a-2b-2c
=2(a-b-c)