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2014-09-19T15:35:34+03:00
X/y=2/5    x=2*y/5        2x+5y=2*2y/5+5y=(4y+5y*5)/5=29y/5
                                   3x+8y=3*2y/5+8y=(6y+8*5y)/5=46y/5

(2x+5y)/(3x+8y)=29y/5 * 5/(46y)=29/46