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3(-2a+b-3c)-2(-a-3b-c)-(3a-4b-2c)=?????

Răspuns :

3(-2a+b-3c)-2(-a-3b-c)-(3a-4b-2c)=

=- 6a+3b-9c+2a+6b+2c-3a+4b+2c

=-7a+13b-5c

-6a+3b-9c+2a+6b+2c-3a+4b+2c=
=-7a+13b-5c