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2014-09-12T13:19:15+03:00
X/4=y/7=k

x=4k
y=7k

(9x-2y)/(x+3y)=  (9*4k-2*7k)/(4k+3*7k)=

=(36k-14k)/(4k+21k)=

= 22k/25k=  22/25