(0.4 - 6/9)/(0.4 + 6/9)/(1/8 - 1/4)=
=(2/5 - 2/3)/(2/5 + 2/3)/(1/8 - 1/4)=
=(- 4/15)/(16/15)/(- 1/8)=
=(- 1/4)/(- 1/8) = 2
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