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daca 2xA+B=5 si 2xB+3xC+=7 calculati 4xA+8xB+9xC


va rog frumos din toata inima ajutatima varooooooooooooog
dau coroana
PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!


Răspuns :

2a+b=5    
4a+2b=10
2b+3c+=7
6b+9c=21
4a+2b+6b+9c=10+21
4a+8b+9c=31