(3a-2b+c)+(-ba-b-2c)+(2a+3b-c)
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(3a-2b+c)+(-ba-b-2c)+(2a+3b-c)
3a-2b+c-ba-b-2c+2a+3b-c
3a+2a -2b-b+3b+c-2c-c-ba
5a -2c - ba
3a-2b+c-ba-b-2c+2a+3b-c
3a+2a -2b-b+3b+c-2c-c-ba
5a -2c - ba
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