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daca 3a+2b+2c=45 si a+2b+2c=99,aflati a+b+c

Răspuns :

3a+2b+2c=45|
a+2b+2c=99| +
4a+4b+4c=144|÷4
a+b+c=36

sper ca te-am ajutat. coroana?