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2014-08-30T11:20:50+03:00
X/y=4/9= k

x=4k
y=9k

(3x+2y)/(5x+y)=  (3*4k+2*9k)/(5*4k+9k)=  (12k+18k)/(20k+9k)=  30k/29k=  30/29
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