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3(-2a+3b-4c)-2(-4a+5b-7c)-(3a-2b+c)=?

Răspuns :

-6a+9b-12c+8a-10b+14c-3a+2b-c=
-a+b+c
[tex]3(-2a+3b-4c)-2(-4a+5b-7c)-(3a-2b+c)= \\ -6a+9b-12c+8a-10b+14c-3a+2b-c=-a+b+c[/tex]