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Stiind ca 2x(a+3b)+3c=131 ,iar c+2b=19,aflati a .

Răspuns :

2(a+3b) +3c=131 => 2a+6b+3c=131
2a +3(2b+c) = 131
2a+ 3x19 = 131
2a + 57 = 131 | scadem 57
2a = 74 | impartim la 2
a=37