<prompt> Kama a,b,c kuridhisha mfumo wa equations b c 12-3a a c -14 - 3b a b 7 - 3c, nini 2a 2b 2c?  <response>: Kuongeza wote tatu ya equations aliyopewa hutoa 2a 2b 2c 12 - 14 7 - 3a - 3b - 3c, hivyo 5a 5b 5c 5. 