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2014-07-02T14:46:24+03:00
(2a+3b)/(4a+15b)=3/9=1/3

3(2a+3b)=4a+15b

6a+9b=4a+15b

6a-4a=15b-9b

2a=6b

a=3b

a/b=3/1=3