((6/9 - 1/2)·(3/2) - (83 - 8)/90)/(0.5 - 1/3)=
=((2/3 - 1/2)·(3/2) - 5/6)/(1/2 - 1/3)=
=(1/6·(3/2) - 5/6)/(1/6)=
=(1/4 - 5/6)/(1/6)=
=(- 7/12)/(1/6)= - 7/2
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