(2.3\9-1.7\9)+ 6.4\9 -(4.2\9+8\9)=
(2.3/9-1.7/9) + 6.4/9 - (4.2/9+8/9)=-0.5777777(7)
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(2.3/9-1.7/9) + 6.4/9 - (4.2/9+8/9)=-0.5777777(7)