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2014-10-22T20:31:09+03:00
3a-2b=b-2a+c  3a-2b-b+2a-c=0
 5a-3b-c=05a-3(b+c)+145/5-8 =5a-3b-3c+29-8=5a-3b-3c+21=0+21=21

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