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2014-08-14T15:51:37+03:00
5(7x+3y)=4(5x+6y)
35x+15y=20x+24y
15x=9y
5x=3y
x/3=y/5=k
x=3k
y=5k
5x+2y/y-x=5*3k+2*5k/5k-3k=15k+10k/2k=25k/2k=25/2