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2(3a+9b-7c)-3(4a+5b+9)-5(a+2b-8c)
rezolvat complet va rogggggg


Răspuns :

6a+18b-14c-12a-15b-27c-5a+10b+40c
=-11a+13b-c

=6a+18b-14c-12a-15b-27-5a-10b+40c=-11a+8b+26c-27