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2014-10-07T15:29:14+03:00
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  • Utilizator Brainly
2014-10-07T15:31:22+03:00
A+2b+c=51
2a+b+2c=42
_______________ +
3a+3b+3c=93
3 (a+b+c)=93/:3
a+b+c=31
2 5 2