produtos notaves (3a-2b+c)+(-6a-b 2c)+(2a+3b-c)
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(3a-2b+c)+(-6a-b+2c)+(2a+3b-c)=
3a-2b+c-6a-b+2c+2a+3b-c=
3a-6a+2a-2b-b+3b+c+2c-c=
-3a+2a-3b+3b+3c-c=
Resposta= -a+2c
3a-2b+c-6a-b+2c+2a+3b-c=
3a-6a+2a-2b-b+3b+c+2c-c=
-3a+2a-3b+3b+3c-c=
Resposta= -a+2c
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