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Daca a+b=71 si b+c=23 calculati 5a+3b-2c+7 URGENT DAU COROANA!!!!​

Răspuns :

5a+5b=335
2b+2c= 46 si scazi cele doua ecuatii si obtii
5a+5b-2b-2c= 335-46=289
5a+3b-2c+7=289+7= 296