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2014-09-16T20:48:27+03:00

a/4 = b/ 7= c/ 5 = 5a/20 =2b/14 = c/5 =( 5a-2b + c) /(20 - 14 + 5) = 33/11 = 3 a/4 = 3    a=12     b/7 = 3     b = 21     c/5 =3    c = 15