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stiind ca 2x(a+3b)+3c=125,iar c+2b=17,aflati a

Răspuns :

2x(a+3b)+3c=125
2a+6b+3c=125
2a+3(2b+c)=125
2a+3*17=125
2a+51=125
2a=125-51
a=74/2
a=37