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2014-09-20T10:36:44+03:00
2a+b=5 /x2 => 4a+2b=10
2b+3c=7 /x3 => 6b+9c=14
4a+8b+9c=10+14=24
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2014-09-20T10:41:39+03:00
2a+b=5  | *2  ⇒ 4a+2b=10
2b+3c=7 | *3 ⇒ 6b+9c=21
Daca le adun obtin 
4a+(2b+6b)+9c= 4a+8b+9c=31

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