2/7 - (1/4 - 2/3) : (1/2 + 2/3)=
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2/7 - (1/4 - 2/3) : (1/2 + 2/3)=
2/7 - (3/12-8/12) : (3/6+4/6)=
2/7-(-5/12) : (7/6) =
2/7+5/12 : 7/6
60/84+35/84 :7/6
95/84 : 7/6= 570/588
............Kd
2/7 - (3/12-8/12) : (3/6+4/6)=
2/7-(-5/12) : (7/6) =
2/7+5/12 : 7/6
60/84+35/84 :7/6
95/84 : 7/6= 570/588
............Kd
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