simplify a-[2b-{a-(c-b-a)=3c-3(a-b)}]
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=a-[2b-{a-(c-b-a)=3c-3(a-b)}]
=a-[2b-{a-c+b+a=3c-3a+3b}]
=a-[2b-2a+c-b=3c-3a-3b]
=a-b+2a-c=3c-3a-3b
=3a-b-c=3c-3a-3b
=3a-b-c-3c+3a+3b=0
=6a+2b-4c=0
=3a+b-2c=0
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