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2014-04-30T21:42:12+03:00
7A + 5B + 3C = A + B + 3C + 6A + 4 B = 108 + 6A + 4B = 108 + 2 (3A + 2B) = 108 + 2 (2A +B -3C + A +B +3C) = 108 + 2 (24 + 108) = 108 + 2 * 132= 108 + 264 =372
2 3 2