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2014-09-10T16:57:22+03:00
A/b=7/5=>a=7b/5
a-b=23=>7b/5-b=23
b(7/5-1)=23
b*2/5=23
b=23*5/2=115/2
a=23+b=23+115/2=46/2+115/2=161/2